Control method of a laundry machine

ABSTRACT

A laundry machine and a control method thereof are provided in which laundering ability may be improved while also improving efficiency and noise/vibration. The laundry machine employs a plurality of drum motions by varying drum rotational speed, drum rotational direction, and drum starting and stopping point, to provide different motion of laundry items in the drum.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. application Ser.No. 12/854,263 filed on Aug. 11, 2010, which claims priority under 35U.S.C. §119 to Korean Application Nos. 10-2009-0073826 filed on Aug. 11,2009; 10-2009-0073827 filed on Aug. 11, 2009; 10-2009-0073828 filed onAug. 11, 2009; 10-2009-0079827 filed on Aug. 27, 2009; 10-2009-0080128filed on Aug. 27, 2009; 10-2009-0073976 filed on Aug. 11, 2009;10-2009-0073977 filed on Aug. 11, 2009; 10-2009-0073959 filed on Aug.11, 2009; 10-2009-0073960 filed on Aug. 11, 2009; 10-2009-0073979 filedon Aug. 11, 2009; 10-2009-0073980 filed on Aug. 11, 2009;10-2009-0073981 filed on Aug. 11, 2009; 10-2009-0079915 filed on Aug.27, 2009; 10-2009-0073978 filed on Aug. 11, 2009; and 10-2009-0105116filed on Nov. 2, 2009, and which is a continuation-in-part applicationof U.S. application Ser. No. 12/509,682 filed in the U.S. on Jul. 27,2009, claiming priority to 10-2008-0075673 filed in Korea on Aug. 1,2008 and 10-2008-0090212 filed in Korea on Sep. 12, 2008; Ser. No.12/509,693 filed in the U.S. on Jul. 27, 2009, claiming priority to10-2008-0087871 filed in Korea on Sep. 5, 2008; and Ser. No. 12/749,760filed in the U.S. on Mar. 30, 2010, claiming priority to 10-2009-0027664filed in Korea on Mar. 31, 2009 and 10-2009-0087141 filed in Korea onSep. 15, 2009, whose entire disclosure(s) are hereby incorporated byreference.

BACKGROUND 1. Field

This relates to a laundry machine and a control method thereof.

2. Background

Laundry machines are machines which are typically used to wash and/ordry fabric articles. Laundry machines may include a drum rotatablyinstalled in a cabinet, with the drum being configured to receivelaundry items therein for treatment. In a top loading laundry machine,the drum may be oriented substantially vertically, with an opening at atop end thereof through which the laundry items may be received. In afront loading laundry machine, the drum may be oriented substantiallyhorizontally, or at a slight incline, with an opening at a front endthereof through which the laundry items may be received. Movement of thedrum and friction between the laundry items, wash water and wash agents,and the interior of the drum, may facilitate contaminant removal fromthe laundry items.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments will be described in detail with reference to thefollowing drawings in which like reference numerals refer to likeelements wherein:

FIG. 1 is an exploded perspective view of an exemplary laundry machineas embodied and broadly described herein;

FIG. 2 is an exploded view of another exemplary laundry machine asembodied and broadly described herein;

FIGS. 3, 4, 5 and 6 illustrate various drum motions and laundry movementpatterns as embodied and broadly described herein; and

FIGS. 7A-21 are flowcharts of various operation courses including thedrum motions shown in FIGS. 3, 4, 5 and 6, in accordance withembodiments as broadly described herein; and

FIGS. 22-24 illustrate effects and conditions to determine the motions.

DETAILED DESCRIPTION I. Laundry Machine

A laundry machine and a control method thereof, as embodied and broadlydescribed herein, will be described in reference to the accompanyingdrawings. FIG. 1 is an exploded perspective view of a laundry machineaccording to a first embodiment as broadly described herein, to whichcontrol methods according to various embodiments may be applied.

In reference to FIG. 1, a laundry machine 100 according to a firstembodiment includes a cabinet 110 configured to define an exteriorappearance thereof, a tub 120 provided in the cabinet 110 to hold washwater therein and a rotatable drum 130 provided in the tub 120. Thecabinet 110 defines the exterior appearance of the laundry machine 100.A door 113 is provided at an opening 114 of the cabinet 110 and a useropens the door 113 to load laundry into the cabinet 110.

The tub 120 is provided in the cabinet 110 to hold wash water therein.The drum 130 may be rotatable in the tub 120 and may accommodate laundrytherein. In this case, a plurality of lifters 135 may be provided in thedrum 130 to lift and drop the laundry during washing. The drum 130includes a plurality of through-holes 131 to allow the wash water heldin the tub 120 to pass therethrough. The tub 120 may be supported by oneor more springs provided at an outer side of the tub 120. A motor 140 ismounted to a rear surface of the tub 120 and the motor 140 rotates thedrum 130. When vibration is generated by the drum 130 rotated by themotor 140, the tub 120 is vibrated in communication with the drum 130.When the drum 130 is rotated, the vibration generated in the drum 130band the tub 120 may be absorbed by a damper located under the tub 120.

As shown in FIG. 1, the tub 120 and the drum 130 may be providedsubstantially in parallel to a base plate of the cabinet 110.Alternatively, rear portions of the tub 120 and the drum 130 may bepositioned at an oblique orientation, with the open end of the drum 130oriented slightly upward to facilitate loading laundry into the drum130.

A control panel 115 may be provided in a predetermined portion of afront of the cabinet 110. The user may select a course of the washingmachine via the control panel 115 or recognize information relating tothe washing machine. For example, a course selecting part 117 configuredfor the user to select a particular washing course may be provided inthe control panel 115. Furthermore, an option selecting part 118 may beprovided to allow the user to adjust operational conditions of eachcycle or step provided in the selected course and a display part 119 maybe provided in the control panel 115 to display current operationinformation of the washing machine. More details of the washing machineis described in U.S. Pat. No. 6,460,382 B1 issued Oct. 8, 2002 and U.S.application Ser. No. 12/704,923 filed Feb. 12, 2010, whose entiredisclosures are incorporated herein by reference.

FIG. 2 is an exploded perspective view of a laundry machine according toanother embodiment as broadly described herein. A laundry machineaccording to various embodiments as broadly described herein may includea tub fixedly supported to a cabinet, or a tub supported to a cabinetvia a flexible structure such as suspension unit, and thus not fixedlysecured thereto, as shown in FIG. 2. Also, the supporting structure ofthe tub may be between the supporting via the suspension unit and thecomplete fixing structure. That is, the tub may be supported flexiblyvia a suspension unit which will be described later, it may be supportedfixedly to be a more rigidly supported state than the above flexiblesupported state. In alternative embodiments, the laundry machine may beprovided without a cabinet. For example, an installation space of abuilt-in type laundry machine may be defined by a wall structure insteadof a cabinet. That is, in certain embodiments, a cabinet configured toform an independent exterior appearance may not be provided.

In reference to FIG. 2, a tub may include a tub front 200 and a tub rear220 composing a rear portion of the tub front 200. The tub front 200 andthe tub rear 220 may be assembled by screws or other appropriatefastening mechanism, and a predetermined space is formed therein toaccommodate a drum. The tub rear 220 includes an opening formed in arear surface thereof and a rear gasket 250 may be connected to an innercircumference of the opening. The rear gasket 250 may be connected to atub back 230 and the tub back 230 may include a through-hole having ashaft that passes through a center thereof.

The rear gasket 250 is sealed and connected to each of the tub back 230and the tub rear 220 to prevent wash water from leaking from the tub. Asthe tub back 230 vibrates when the drum is rotated, the tub back 230 maybe distant from the tub rear 220 a predetermined distance not tointerfere with the tub rear 220. Also, the rear gasket 250 may be formedof flexible material to enable the tub back 230 to relative-move, notinterfering with the tub rear 220. The rear gasket 250 may include acorrugated part which is extendible to an enough length to allow therelative motion of the tub back 230. This embodiment presents the reargasket 250 connected to the tub back 230 and the present invention isnot limited thereto. The rear gasket 250 is configured to seal the gapbetween the tub and a driving part (not shown) including a shaft 351 anda bearing housing 400 and to allow the driving part to relative-movewith respect to the tub. As a result, the shapes and the connectedobjects of the rear gasket 250 may be variable unlimitedly, only if thisfunction is enabled. A flexible material 280 which will be described asfront gasket later may be installed at a front portion of the tub front200.

The drum may be configured of a drum front 300, a drum center 320 and adrum back 340. Ball balancers 310 and 330 may be installed in front andrear portions of the drum, respectively. The drum back 340 may beconnected to a spider 350 and the spider 350 may be connected to theshaft 351. The drum is rotatable within the tub by a rotational forcetransmitted via the shaft 351.

The shaft 351 may be connected to a motor and pass through the tub back230. In certain embodiments, the motor may be connected to the shaft 351concentrically. In certain embodiments, the motor may be directlyconnected to the shaft 351, and in particular, a rotor of the motor maybe directly connected to the shaft 351. In alternative embodiments, themotor and the shaft 351 may be indirectly connected with each other, forexample, they may be connected by a belt.

The bearing housing 400 may be secured to the tub back 230 to rotatablysupport the shaft, between the motor and the tub back 230. A stator maybe fixedly secured to the bearing housing 400. And the rotor may belocated around the stator. As mentioned above, the rotor may be directlyconnected to the shaft 351, with the motor being an outer rotor typemotor that may be connected with the shaft directly. The bearing housing400 may be supported by a base 600 via the suspension unit. Thesuspension unit may include a perpendicular suspension and an obliquesuspension configured to support the bearing housing 400 with respect toa forward and backward direction. For example, the suspension unitaccording to this embodiment may include three perpendicular (vertical,as shown in FIG. 2) suspensions 500, 510 and 520 and two oblique(angled, or inclined, as shown in FIG. 2) suspensions 450 and 530configured to support the bearing housing 400 with respect to a forwardand backward direction. The suspension unit may be connected to the base600 with a predetermined elastic transformation enabling aforward/backward and/or rightward/leftward movement of the drum, andthus not connected fixedly. That is, the suspension unit may besupported by the base, with sufficient predetermined elasticity to allowrotation at a predetermined angle in forward/backward andrightward/leftward directions with respect to the points connected withthe base. For such the elastic support, the perpendicular suspension maybe installed to the base by a rubber bushing or other mechanism asappropriate.

The perpendicular suspension of the suspension unit may suspend thevibration of the drum elastically and the oblique suspension may dampenthe vibration. That is, the perpendicular suspension may be used asspring and the oblique suspension as damping means in a vibration systemincluding a spring and damping means.

The tub is supported to the cabinet and the vibration of the drum may bedamped by the suspension unit. As a result, the laundry machineaccording to this embodiment may have a substantially independentsupporting structure between the tub and the drum or it may have astructure having the vibration of the drum not directly transmitted tothe tub.

II. Drum Rotation Motion

Diversification of drum driving motions and combinations thereof, asembodied and broadly described herein, may provide significantimprovements in washing ability, noise/vibration, energy consumption,and customer satisfaction. A control method that provides improvedwashing ability will be described. The hand-wash effect may be embodiedby various movement patterns of the laundry. For example, the hand-washeffect may be embodied by a combination of massaging and/ordisentangling and/or striking and/or swinging and/or rubbing and/orsqueezing/filtrating.

Such various movement patterns of the laundry may be implemented byvarious drum driving motions and combination(s) of different drumdriving motions. The drum driving motions may include combinations ofrotation directions and rotation speeds. The laundry located in the drummay have different falling directions, falling points and fallingdistance because of the drum driving motions. Because of that, thelaundry may have different movement inside the drum. The drum drivingmotions may be embodied by, for example, controlling rotation directionand/or speed of the motor that drives the drum.

When the drum is rotated, the laundry is lifted by one or more lifts 135provided at the inner circumferential surface of the drum. Because ofthat, the rotation direction of the drum may be controlled and the shockapplied to the laundry may be varied accordingly. That is, a mechanicalforce applied to the laundry such as the friction generated betweenlaundry items, the friction generated between the laundry and the water,and the dropping shock of the laundry may be varied. In other words, adegree of striking or scrubbing applied to the laundry items so as towash the laundry may be varied and a degree of laundry distribution orturn-over inside the drum may be varied accordingly.

As a result, such a control method of the laundry machine may providevarious drum driving motions and the drum driving motions are variedaccording to each of the cycles and a specific step composing the cycle,such that an optimal mechanical force may be used to treat the laundrydepending on the type of laundry being washed, the soil level, and othersuch factors. Because of that, washing efficiency of the laundry may beimproved. In addition, the excessive time required by the typical drumdriving motion may be avoided.

In certain embodiments, to embody such various drum driving motions, themotor 140 may be a direct connection type. That is, the motor may have astator fixed to a rear surface of the tub 120 and a rotor that rotatesthe drum 120 directly. Since the rotation direction and torque of thedirect connection type motor may be controlled, time delay or backlashmay be prevented and then the drum driving motion may be controlled asappropriate.

In contrast, drum driving motions allowing time delay or backlash, forexample, a tumbling motion or spin motion, may be embodied in anindirect connection type motor including a pulley such that its torquemay be transmitted to a shaft via the pulley. However, the indirectconnection type motor may have limited applicability.

The drum driving motion may be embodied by the control of the motor 140.As a result, the control method of the motor may be diversified and thenthe various drum driving motions may be achieved.

Movement patterns of the laundry and the drum driving motion to achievethe movement pattern of the laundry will be described in detailhereinafter.

A massaging movement pattern of the laundry may be achieved if thefriction between the laundry and the drum is maximized. For example,when the drum is continuously rotated in a predetermined direction at apredetermined speed or less, the laundry may be rolling-moved to achievethe massaging effect. if the rotation speed of the drum driven in thetumbling motion is defined as a reference speed, the predetermined speedmay be the reference speed. For example, a drum driving motionconfigured to rotate the drum at a predetermined speed or less in apredetermined direction may be defined as ‘rolling motion’.

A disentangling movement pattern may be embodied by, for example, atumbling motion. The tumbling motion may be defined as a motionconfigured to continuously rotate the drum at the reference speed in apredetermined direction. The disentangling movement pattern drops thelaundry inside the drum, with a medium level dropping distance and amedium sized friction.

A striking movement pattern may be achieved by dropping the laundryinside the drum from a maximum dropping distance. For example, if thedrum is rotated at the reference speed or more to lift the laundry tothe highest point inside the drum, and then the drum is suddenly braked,such a striking effect may be achieved. This drum driving motion may bedefined as ‘step motion’.

A swing movement pattern may be achieved when the drum is rotated at apredetermined speed lower than the reference speed in theclockwise/counter-clockwise direction. Such a drum driving motion may bedefined as ‘swing motion’.

A rubbing movement pattern may be achieved when the friction between thelaundry and the drum is increased. For example, if the drum rotating atthe reference speed or more in the clockwise direction is suddenlybraked and then rotated in the counter-clockwise direction, the laundryis rolling-moved along the inner circumferential surface of the drumfrom a predetermined high point of the drum. Such a drum driving motionmay be defined as ‘scrub motion’.

A squeezing and filtrating movement pattern may be achieved if washwater is supplied while rotating the drum at the reference speed ormore. Once the drum is rotated at a relatively high speed, the laundrymay unfold, or spread out and cling along the inner circumferentialsurface of the drum and then the wash water sprayed into the drum passesthrough the laundry and then the laundry may be squeezed to improve therinsing effect. Such a drum driving motion may be defined as ‘filtrationmotion’

Various drum driving motions configured to achieve the above variousmovement patterns of the laundry will be described in reference to thedrawings.

FIG. 3 is a diagram of various drum driving motions as embodied andbroadly described herein.

FIG. 3 (a) is a diagram of a rolling motion. In the rolling motion, themotor 140 continuously rotates the drum 130 in a predetermined directionand the laundry located on the inner circumferential surface of the drumrotating along the rotation direction of the drum is dropped from theposition at an angle of approximately less than 90° with respect to therotation drum of the drum to the lowest point of the drum.

That is, once the motor 140 rotates the drum at a speed that is lowerthan a reference rotational speed (tumbling rotational speed), forexample, at approximately 40 RPM, the laundry located in the lowestpoint of the drum 130 is lifted to a predetermined height along therotation direction of the drum 130 and then the laundry rolling-moves tothe lowest point of the drum from the position of less than 90° withrespect to the rotation direction of the drum from the lowest point ofthe drum. Visually, in case the drum is rotated in a clockwisedirection, the laundry is continuously rolling in a third quadrant ofthe drum.

The laundry is washed by the maximum friction with the washing water andthe maximum friction with other washing items and the maximum frictionwith the inner circumferential surface of the drum in the rollingmotion. This rolling motion enables enough turn-over of the laundry togenerate an effect of soft massaging-like washing. The drum RPM of thedrum driving motion may determined based on a relationship to a radiusof the drum. That is, the larger the drum RPM is, the larger thecentrifugal force is that is generated in the laundry inside the drum. Adifference between the size of the centrifugal force and the force ofgravity applied to the laundry items in the drum differentiates thepoint at which the laundry is dropped and the corresponding motion ofthe laundry inside the drum. Both the rotation force of the drum and thefriction between the drum and the laundry may also be considered. Thus,the RPM of the drum in the rolling motion may be determined so as toallow the generated centrifugal force and the friction force to besmaller than gravity (1 G).

FIG. 3 (b) is a diagram of a tumbling motion. In the tumbling motion,the motor 140 continuously rotates the drum 130 in a predetermineddirection and the laundry located on the inner circumferential surfaceof the drum is dropped from the position of approximately 90° to 110°with respect to the rotation direction of the drum to the lowest pointof the drum. If the drum is controlled to be rotated at a proper RPM ina predetermined direction, the mechanical force may be generated betweenthe laundry and the drum in the tumbling motion. Because of that, thetumbling motion may be used in washing and rinsing.

That is, the laundry loaded into the drum 130 is located at the lowestpoint of the drum 130 before the motor 140 is driven. When the motor 140provides a torque to the drum 130, the drum 130 is rotated and thelifter 135 provided at the inner circumferential surface of the drumlifts the laundry to a predetermined height from the lowest point of thedrum. If the motor 140 rotates the drum 130 at the reference rotationalspeed, for example, approximately at 46 RPM, the laundry may be liftedto the position of approximately 90° to 110° with respect to therotation direction of the drum and then dropped to the lowest point ofthe drum. In the tumbling motion, the drum RPM may be determined so asto allow the generated centrifugal force to be larger than thecentrifugal force generated in the rolling motion and to be smaller thangravity.

Visually, if the drum is rotated in the clockwise direction in thetumbling motion, the laundry is sequentially lifted to the thirdquadrant and a part of a second quadrant from the lowest point of thedrum. After that, the laundry is dropped to the lowest point of thedrum. As a result, the tumbling motion enables the laundry to be washedby the shock generated by the friction with the washing water and thedropping shock. Because of that, in the tumbling motion, a mechanicalforce larger than the mechanical force of the rolling motion may be usedto implement washing and rinsing. Also, the rolling motion may beeffective in separating entangled-laundry and distributing the laundryuniformly.

FIG. 3 (c) is a diagram of a step motion. In the step motion, the motor140 rotates the drum 130 in a predetermined direction and the laundrylocated at the inner circumferential surface of the drum is controlledto be dropped to the lowest point of the drum from the highest point(approximately 180°) with respect to the rotation direction of the drum.Once the motor 140 rotates the drum 130 at a speed that is higher thanthe reference rotational speed (tumbling rotational speed), for example,at approximately 60 RPM or more, the laundry may be rotated by thecentrifugal force until reaching the highest point of the drum, withoutbeing dropped. In the step motion, the drum is rotated at apredetermined speed so as to not drop the laundry, and then is suddenlybraked to maximize the shock applied to the laundry as it is dropped.

After rotating the drum 130 at the predetermined speed capable of notdropping the laundry (approximately 60 RPM or more) until the laundryreaches near the highest point of the drum, the motor 140 supplies areverse torque to the drum 130 with the laundry located near the highestpoint of the drum (180° with respect to the rotation direction of thedrum). Thus, the laundry is lifted from the lowest point of the drum 130along the rotation direction of the drum, the drum is stoppedmomentarily by the reverse torque of the motor, and the laundry isdropped from the highest point to the lowest point of the drum 130. Thestep motion enables the laundry to be washed by the shock generatedwhile the laundry is dropped with the maximum height difference. Amechanical force generated in this step motion is larger than themechanical force generated in the rolling motion or tumbling motionmentioned above.

Visually, in the step motion, after moving from the lowest to thehighest point of the drum via as the drum is rotated, the droppingdistance inside the drum is the largest in the step motion, and themechanical force of the step motion may be applied to a small amount ofthe laundry effectively. The motor 140 may be reversing-phase-braked inthe step motion using a torque generated in a reverse direction withrespect to a rotation direction of the motor. A phase of a currentsupplied to the motor may be reversed to generate a reverse torque in areverse rotation direction of the motor and the reversing-phase brakeenables the sudden brake to be applied. The reversing-phase brake may beused to apply the strong shock to the laundry.

Thus, after applying torque to rotate the drum in the clockwisedirection, torque is applied to rotate the drum in the counter-clockwisedirection and the drum is braked suddenly. After that, a torque isapplied to the drum to rotate in the clockwise direction and the stepmotion is embodied. The step motion may be used to wash the laundryusing the friction between the water drawn via the through hole 131formed in the drum and the laundry and using the shock generated by thelaundry dropping when the laundry reaches the highest point of the drum.This step motion may generate an effect of ‘striking laundry’-likewashing.

FIG. 3 (d) is a diagram of a swing motion. In the swing motion, themotor 140 rotates the drum 130 in clockwise and counter-clockwisedirections alternatively and the laundry is dropped at a position ofapproximately less than 90° with respect to the rotation direction ofthe drum. That is, once the motor 140 rotates the drum 130 at a speedthat is lower than the reference rotational speed (tumbling rotationalspeed), for example, at approximately 40 RPM in the counter-clockwisedirection, the laundry located at the lowest point of the drum 130 islifted a predetermined height along the counter-clockwise direction.Before the laundry reaches the approximately 90° position with respectto the counter-clockwise direction of the drum, the motor stops therotation of the drum and the laundry is dropped to the lowest point ofthe drum from the approximately less than 90° position with respect tothe counter-clockwise direction of the drum.

Hence, the motor 140 rotates the drum 130 at a speed that is lower thanthe reference rotational speed (tumbling rotational speed), for example,at approximately 40 RPM in the clockwise direction to lift the laundry apredetermined height in the clockwise direction along the rotationdirection of the drum. Before the laundry reaches the position ofapproximately 90° with respect to the counter-clockwise direction of thedrum, the motor stops the rotation of the drum and the laundry isdropped to the lowest point of the drum from the less than 90° positionwith respect to the clockwise direction of the drum.

Thus, the swing motion is a motion in which the rotation and stop withrespect to a first direction and the rotation and stop with respect to asecond (opposite) direction may be repeated. Visually, the laundry thatis lifted to a part of the second quadrant from the third quadrant ofthe drum is dropped softly, and is re-lifted to a part of the firstquadrant from a fourth quadrant of the drum and dropped softly,repeatedly.

In certain embodiments, the motor 140 may use rheostatic braking and aload applied to the motor 140 so that a mechanical abrasion of the motor140 may be reduced, and the shock applied to the laundry may beadjusted. Using rheostatic braking, if a current applied to a motor isoff, the motor functions as generator because of rotational inertia, anda direction of the current flowing in a coil of the motor will bechanged into a reverse direction before the power is off and a force(Fleming's right hand rule) is applied along a direction whichinterferes with the rotation of the motor, to brake the motor. Differentfrom reversing-phase braking, rheostatic braking does not generatesudden braking but instead changes the rotation direction of the drumsoftly. As a result, the laundry may be moved in a figure-8 shape overthe third and fourth quadrants of the drum in the swing motion. Theswing motion may generate ‘swing the laundry’-like washing.

FIG. 3 (e) is a diagram of a scrub motion. In the scrub motion, themotor 140 rotates the drum 130 in both the clockwise andcounter-clockwise directions alternatively and the laundry may bedropped from the position more than 90° with respect to the rotationdirection of the drum.

That is, once the motor 140 rotates the drum 130 at a speed that ishigher than the reference rotational speed (tumbling rotational speed),for example, at approximately 60 RPM or more in the counter-clockwisedirection, the laundry located in the lowest point of the drum 130 islifted a predetermined height in the counter-clockwise direction. Afterthe laundry passes an approximately 90° position with respect to thecounter-clockwise direction of the drum, the motor provides the drum areverse torque to stop the drum temporarily, and the laundry located onthe inner circumferential surface of the drum may be dropped rapidly.resulting particular, the laundry located on the inner circumferentialsurface of the drum is dropped to the lowest point of the drum from theposition of 90° or more with respect to the clockwise direction of thedrum. Thus, the laundry may be dropped rapidly from the predeterminedheight, in the scrub motion. The motor 140 may usereversing-phase-braking to brake the drum.

In the scrub motion, the rotation direction of the drum is changedrapidly and the laundry may not be away from the inner circumferentialsurface of the drum for a great amount of time. Because of that, aneffect of strong-scrubbing-like washing by maximized friction betweenthe laundry and the drum may be achieved in the scrub motion. In thescrub motion the laundry moved to a part of the second quadrant via thethird quadrant is dropped rapidly and is re-dropped after being movedagain to a part of the first quadrant via the fourth quadrant. As aresult, visually in the scrub motion, the lifted laundry is droppedalong the inner circumferential surface of the drum repeatedly.

FIG. 3 (f) is a diagram of the filtration motion. In the filtrationmotion, the motor 140 rotates the drum 130 so that the laundry is notdropped from the inner circumferential surface of the drum, and washingwater is sprayed into the drum. That is, in the filtration motion, thelaundry is spread along and maintains close contact with the innercircumferential surface of the drum as washing water is sprayed into thedrum. The water is discharged out of the tub through the through holes131 of the drum by the centrifugal force. Since the filtration motionspreads out/widens a surface area of the laundry and enables the waterto pass through the laundry, the wash water may be supplied to thelaundry uniformly.

FIG. 3 (g) is a diagram of the squeeze motion. In the squeeze motion,the motor 140 rotates the drum 130 so that the laundry clings to/is notdropped from the inner circumferential surface of the drum usingcentrifugal force, and then the motor lowers the rotation speed of thedrum 130 to temporarily separate the laundry from the innercircumferential surface of the drum. This process is repeated and thewater is sprayed into the drum during the rotation of the drum. That is,the drum is continuously rotated at a speed that is high enough not todrop the laundry from the inner circumferential surface of the drum inthe filtration motion. In contrast, in the squeeze motion, the rotationspeed of the drum is changed to repeat the process of the laundryclinging to and separating from the inner circumferential surface of thedrum 130.

Spraying wash water into the drum 130 in the filtration motion and thesqueeze motion may be implemented by, for example, a circulation pathand a pump. The pump may communicate with the lower surface of the tub120, with an end of the circulation path connected with the pump suchthat wash water is sprayed from the tub into the drum via the other endof the circulation path.

In alternative embodiments, wash water may be sprayed into the drum viaa supply path connected with an external water supply source locatedoutside of the cabinet. That is, one end of the supply path is connectedwith the external supply source and the other end thereof is connectedwith the tub. If a nozzle is provided to spray wash water into the drum,the wash water may be sprayed into the drum in either one or both of thefiltration and squeeze motions.

FIG. 4 is a diagram of the step motion in more detail.

First of all, the laundry is moved from a lowest point to a highestpoint of the drum 130 as shown in FIG. 4 (a)-(c). As described withrespect to the tub 120 standing still adjacent to the drum 130, thelaundry received in the drum 130 is moved from a position adjacent tothe lowest point of the tub 120 to the highest point of the tub 120. Forsuch the movement of the laundry, the motor 140 applies a rotationforce, namely, a torque to the drum in a predetermined direction, whichis a clockwise direction as shown in the drawings, and the drum 130 isrotated along the predetermined direction together with the laundry, tolift the laundry.

The laundry may be rotated together with the drum, in close contact withan inner surface of the drum 130 by a friction force with lifters andthe inner circumferential surface of the drum 130. The laundry is liftedto the highest point of the drum 130, without being separated from thedrum 130 by rotating the drum 130 at approximately 60 RPM or more, asthis rotation speed generates a predetermined centrifugal forcesufficient to prevent the laundry from separating from the drum 130 upto the highest point of the drum 130.

The rotation speed of the drum may be changed so that the centrifugalforce generated is larger than gravity, allowing the laundry to berotated together with the drum from the lowest point of the drum 130,which is a predetermined point of the inner surface of the drum adjacentto the lowest point of the tub 120 to the highest point of the tub 120.The laundry is dropped from the highest point of the drum 130 to thelowest point of the drum 130when the drum 130 is suddenly braked, eitherat or just before the laundry reaches the highest point of the drum 130.

Specifically, to brake the drum 130 suddenly, the motor 140 provides thedrum 130 with a reverse-torque. The reverse-torque is generated byreversing-phase braking configured to supply reversing-phase currents tothe motor 140, as described in reference to FIG. 3 (c).Thereversing-phase braking is a type of motor braking using a torquegenerated in a reverse direction with respect to a rotation direction ofthe motor. A phase of a current supplied to the motor may be reversed togenerate a reverse torque in a reverse rotation direction of the motorand the reversing-phase braking enables the sudden brake to be appliedto the motor. For example, as shown in the drawing, a current is appliedto the motor to rotate the drum in the clockwise direction and then acurrent is applied to the motor to rotate the drum in thecounter-clockwise direction suddenly.

The timing point of the reversing-phase-braking with respect to themotor 140 may be closely related to the location of the laundry insidethe drum 130. Because of that, a device used to determine or predict thelocation of the laundry may be provided and a sensing device such as,for example, a hall effect sensor configured to determine a rotationangle of a rotor, may be examples of such a device. The control part maydetermine the rotation angle of the drum by using the sensing device andcontrol the motor 140 to reversing-phase-brake when or just before thedrum has a rotation angle of 180°. As a result, the drum rotated in theclockwise direction is stopped quickly in response to thecounter-clockwise direction torque. The centrifugal force applied to thelaundry is removed and then the laundry is dropped to the lowest point.

Hence, as shown in FIG. 4 (d), the drum 130 is continuously rotated inthe clockwise direction and the rotation/dropping of the laundry isrepeated. Although FIG. 4 shows that the drum is rotated in theclockwise direction, the drum may be rotated in the counter-clockwisedirection to implement the step motion. The step motion generates arelatively large load on the motor 140 and a net acting ratio of thestep motion may be reduced.

The net acting ratio is a ratio of a motor driving time to a total valueof the driving time and the stopping time of the motor 140. If the netacting ratio is ‘1’, it means that the motor is driven without astopping time. The step motion may be implemented at approximately 70%of the net acting ratio, considering the load of the motor. For example,the motor may be stopped for 3 seconds after driving for 10 seconds.Other ratios and driving/stopping times may also be appropriate.

Before the falling laundry reaches the lowest point of the drum, thatis, while the laundry is dropped, the drum 130 starts its rotation toimplement the next step motion. In this case, the drum 130 is rotated toa predetermined angle and after that the laundry reaches the lowestpoint of the drum 130. From this point, the laundry and the drum may berotated together. Although the drum is rotated to 180° as it is set, thelaundry cannot be rotated to 180°, that is, the highest point of thedrum 130 and it cannot be dropped from the highest point to gain thedesired washing ability.

Because of that, the drum 130 is controlled to be re-rotated as shown inFIG. 4 (d) after the laundry reaches the lowest point of the drum. Thatis, the drum remains at a stand still until the laundry reaches thelowest point of the drum. More specifically, at the moment when thelaundry actually starts to be dropped, the stopping of the drum 130 isgenerated. From the dropped point in time until the point at which thelaundry reaches the lowest point of the drum, the drum remains stoppedand does not rotate. The stopped time may be larger than the time takenfor the laundry to be dropped to the lowest point (point 1) from thehighest point of the drum. As a result, the drum may remain stopped for,for example, 0.4 second, or in certain embodiments, 0.6 second, toensure enough time in the stopping state. This allows the step motion tobe implemented more precisely to generate the maximum shock and thedesired washing ability may be achieved accordingly.

FIG. 5 is a diagram of the scrub motion in more detail.

First, the laundry is moved from the lowest point of the drum 130 to aposition reached after 90° or more rotation in the clockwise directionof the drum 130, as shown in FIGS. 5 (a)-(c). As described with respectto the tub 120 standing still adjacent to the drum 130, the laundryinside the drum 130 is moved from the predetermined point of the innerdrum surface adjacent to the lowest point of the tub 120 to the point ofthe inner drum surface rotated to 90° or more along the clockwisedirection of the drum 120. To generate such movement of the laundry, themotor applies a rotation force, that is, a torque to the drum 130 in apredetermined direction, (clockwise direction) and then the drum 130 isrotated together with the laundry to lift the laundry.

The laundry is rotated together with the drum, in close contact with theinner circumferential surface of the drum 130 by the lifter and thefriction with the inner circumferential surface of the drum, and is notseparated from the drum 130. For that, the drum is rotated atapproximately 60 RPM or higher to generate enough centrifugal force sothat the laundry is not separated from the drum 130. The rotation speedof the drum may be set to generate a centrifugal force larger thangravity taking the size of the drum, such as an inner diameter, intoconsideration. As a result, the laundry is rotated together with thedrum from the lowest point of the drum to the position of 90° or morerotation with respect to the lowest point of the drum.

The laundry is then dropped from the position of 90° or more rotation tothe lowest point. For this dropping of the laundry, the drum 130 issuddenly braked when the laundry reaches the position of 90° or moredrum rotation. The motor 140 provides the drum 130 with a reverse-torqueto apply the sudden brake to the drum. As mentioned above in referenceto FIG. 3 (e), the reverse-torque is a reverse-torque generated byreversing-phase braking configured to supply reversing-phase currents tothe motor 140.

The control part may determine a rotation angle of the drum by using asensing device as described above. Once the rotation angle of the drumis 90° or more, the control part may control the motor 140 to bereversing-phase-braked. As a result, the drum 130 rotating in theclockwise direction is provided with torque in the counter-clockwisedirection to momentarily stop rotation and remove the centrifugal forceapplied to the laundry. As shown in FIG. 5 (c), the laundry may not bedropped perpendicularly by the torque of the counter-clockwise directionbut dropped to the lowest point of the drum obliquely toward the innercircumferential surface of the drum. Because of the inclined dropping,the laundry may have a relatively large amount of friction with theinner surface of the drum in the middle of the dropping and thesimultaneous friction between the laundry items and between the laundryand the wash water may be relatively large.

Hence, as shown in FIG. 5 (d), the drum 130 is rotated in thecounter-clockwise direction continuously and the rotation/dropping ofthe laundry mentioned above may be repeated. FIG. 5 shows that drum isrotated in the clockwise direction earlier but the rotation of thecounter-clockwise direction may be implemented earlier. The scrub motiongenerates a relatively large load applied to the motor 140, like thestep motion, and the net acting ratio of the scrub motion may bereduced, for example, stopping of 3 seconds after the scrub motion maybe repeated and the net acting ratio of the scrub motion may becontrolled to be 70%. Other arrangements may also be appropriate.

Before the falling laundry reaches the lowest point of the drum, thatis, while the laundry is dropped, the drum 130 starts its reversedirection rotation to implement the next step motion. In this case, thedrum 130 is rotated to a predetermined angle and after that the laundryreaches the lowest point of the drum 130. From this point, the laundryand the drum may be rotated together. Although the drum is rotated to90° as it is set, the laundry cannot be rotated to 90°, that is, thehighest point of the drum 130 and it cannot be dropped from the highestpoint to gain the desired washing ability.

Because of that, the drum 130 is re-rotated as shown in FIG. 5 (d) afterthe laundry reaches the lowest point of the drum. That is, the drum iscontrolled to keep standing still until the laundry reaches the lowestpoint of the drum. More specifically, at the moment when the laundryactually starts to be dropped, the stopping of the drum 130 isgenerated. From point in time at which the laundry is dropped until thelaundry reaches the lowest point of the drum, the drum remains in thestopped state and does not rotate. The time period of the drum stoppingstate may be larger than the time taken for the laundry to be dropped tothe lowest point of the drum. As a result, the stopping state kept bythe drum may be set to, for example, 0.2 second, which is smaller thanthe stopping state of the drum in the step motion.

As such the stopping state kept by the drum is set, the step motion maybe implemented more precisely so as to generate the maximum frictionbetween the drum inner surface and the laundry, maximum friction betweenlaundry items, and maximum friction between the laundry and the washwater and the desired washing ability may be achieved accordingly.

FIG. 6 is a graph comparing washing ability and vibration level of eachmotion shown in FIG. 3. A horizontal axis presents the washing ability,with easier separation of contaminants contained in the laundry movingto the left. A vertical axis presents the vibration or noise level, withhigher levels moving upward, with the washing time for the same laundrybeing reduced.

The step motion and the scrub motion are proper to washing coursesimplemented to reduce the washing time when the laundry has severecontaminant. The step motion and the scrub motion have a highvibration/noise level and are typically not used to wash sensitivefabric and/or to minimize noise and vibration.

The rolling motion has a good washing ability and a low vibration level,with minimized laundry damage and low motor load. As a result, therolling motion may be used in all of the washing courses, especially, toaid detergent dissolution in an initial washing stage and to wet thelaundry.

The tumbling motion has a lower washing ability than the scrub motionand a middle vibration level in comparison to the scrub motion and therolling motion. The rolling motion has a lower vibration level but ithas a longer washing time than the tumbling motion. Because of that, thetumbling motion may be applicable to all of the washing courses and maybe effective in a washing course to distribute the laundry uniformly.

The squeeze motion has a similar washing ability to the tumbling motionand a higher vibration level than the tumbling motion. The squeezemotion repeats the process of drawing the laundry toward and separatingthe laundry from the inner circumferential surface of the drum. In thisprocess, the wash water is discharged outside of the drum after passingthrough the laundry. Thus, the squeeze motion may be applied to rinsing.

The filtration motion has a lower washing ability than the squeezemotion and a similar noise level to the rolling motion. In thefiltration motion, the water passes through the laundry and isdischarged out of the drum, with the laundry in close contact with theinner circumferential surface of the drum. As a result, the filtrationmotion may be applied to a course for wetting of the laundry.

The swing motion has the lowest vibration level and washing ability andmay be applied in a low noise and low vibration washing course and acourse for washing sensitive or delicate articles.

As mentioned above, each drum driving motion has its own advantages andit is preferable that those various drum driving motions are used tomaximize the advantages. Each drum driving motion may also haveadvantages and disadvantages in relation to the laundry amount. Even incase of the same course and cycle, the various drum driving motions maybe applied differently depending on the relation with the laundryamount.

An interior of the drum in the drum type washing machine may be visiblefrom the exterior via the door. The various drum driving motions may beimplemented in a washing course which will be described later. As aresult, the user may view the various drum driving motions implementedin the interior of the drum. That is, a soft striking type of washing(tumbling motion), a strong striking type of washing (step motion), softscrubbing type of washing (rolling motion) and a strong scrubbing typeof washing (scrub motion) may be visibly identified. Because of that,the user may sense that washing is implemented well, which may generateimproved user satisfaction in addition to the substantially improvedwashing efficiency.

III. Courses of a Laundry Machine

Various control methods, that is, various courses of a washing machineas embodied and broadly described herein, will now be discussed.

A. Course A (Standard Course)

Course A will be described in reference to FIG. 7A. Course A is astandard course which may be used to wash normal laundry without anyauxiliary option. Course A includes a washing cycle, a rinsing cycle anda spinning cycle. The user may select the standard course from a courseselecting part 117 (S710).

A.1 Washing Cycle (S730):

The washing cycle includes a water supplying step (S733) that supplieswash water and detergent to a tub 120 or a drum 130 to dissolve thedetergent in the wash water, and a washing step (S742) configured todrive the drum to wash the laundry. In the water supplying step, wateris supplied from an external water supply source to the washing machine,together with the detergent. By improving efficiency of the watersupplying step in preparation for the washing step, efficiency of thewashing cycle including washing efficiency and washing time reductionmay also be achieved.

A.1.1 Determining Laundry Amount (S731):

As mentioned above, the water supplying step is done in preparation forthe main-washing step. As a result, detergent dissolution, laundrywetting and the like may be implemented quickly and completely. However,considering the capacity of the drum and the amount of the wash watersupplied to the drum, a drum driving motion may be controlled accordingto the amount of the laundry in the drum in the water supplying step.That is, a drum driving motion capable of performing the detergentdissolution and the laundry wetting more efficiently may be selectedbased on the amount of laundry in the drum.

A laundry amount determining step configured to determine the amount ofthe laundry accommodated in the drum may be implemented before the watersupplying step. Based on the determined amount of laundry, the drumdriving motion may be differentiated in the water supplying step.

A laundry amount may be determined by measuring electric currents usedto drive the drum. For example, the currents used to implement a tumblemotion may be measured. To implement the tumble motion, a control partcontrols the drum to be rotated at a predetermined RPM, for example, 46RPM. A current value required to drive the drum at that RPM may bedifferent, depending on the amount of laundry in the drum. Thus, theamount of laundry may be determined based on an amount of currentrequired to drive a particular drum at a particular RPM in a particularmotion.

If the laundry amount is relatively large, sufficient wash water may besupplied to the laundry at an initial stage of the water supplying stepand washing efficiency of the washing may be further improved. The drumdriving motion may be differentiated according to the laundry amount inthe water supplying step and the parameters of the water supplying stepmay be determined appropriately.

A.1.2 Water Supplying (S733):

A.1.2.1 Detergent Type Determining (S734):

In the initial stage of the water supplying step, a detergent typedetermining step may be implemented to determine whether the detergentsupplied during the initial stage of the water supplying step is aliquid type or powder type. This step is implemented to determine a drumdriving motion or the number of rinsings in the rinsing cycle which willbe implemented after the washing cycle. Information relating to thewashing cycle and the rinsing cycle may be available to the user via adisplay part 119 in an initial operation of the washing machine. Becauseof that, the detergent type determining step may be implemented in theinitial stage of the water supplying step, specifically, before adetergent dissolution promoting step.

A.1.2.2 Detergent Dissolution Promoting (S735):

As the wash water and the detergent are supplied in the water supplyingstep, the detergent dissolving step may be implemented. To improve theefficiency of the washing cycle, the detergent may be more completelyand effectively dissolved in the initial stage of the water supplyingstep. As a result, the detergent dissolution promoting step may beimplemented in the water supplying step to promote detergentdissolution.

A motion, namely, drum driving motion to move the laundry inside thedrum to promote the detergent dissolution may be a motion configured tosupply a strong mechanical force to the wash water and the laundry. Forexample, a step motion configured to repeatedly lift the laundry alongthe rotating drum and to drop the laundry from an inner circumferentialsurface of the drum according to a brake applied to the drum may beimplemented in the detergent dissolution promoting step. Alternatively,a scrub motion configured to lift the laundry along the rotating drumand drop the laundry according to the brake and reverse-rotation of thedrum to re-lift the laundry may be implemented instead of the stepmotion. The step motion and the scrub motion are motions configured toapply a sudden brake to the rotating drum to suddenly change themovement direction of the laundry and apply a strong shock to thelaundry. In addition, the step motion and the scrub motion areconfigured to also apply the strong shock to the wash water. As aresult, strong mechanical force is provided in the initial stage of thewater supplying step to promote detergent dissolution and to improve theefficiency of the washing cycle accordingly.

In alternative embodiments, the detergent dissolution promoting step maybe implemented by repeating the sequential combination of the stepmotion and the scrub motion. In this case, two types of drum drivingmotions are combined repeatedly and patterns of the wash water flow maybe more diversified to improve the efficiency of the washing cycle.

In a typical water supplying step, the drum would be driven in thetumbling motion that continuously rotates the drum in a predetermineddirection at a predetermined speed to lift and drop the laundry.However, it is found that the time taken to dissolve detergent in washwater in the tumbling motion may be greater than in either the step orscrub motions, or a combination thereof. For example, the time todissolve detergent in the tumbling motion in an exemplary washer may beapproximately 15 minutes, whereas the time taken to dissolve thedetergent in the wash water in the step motion or scrub motion using thesame washer may be 9 to 10 minutes. Thus, the step motion or scrubmotion may dissolve the detergent in the wash water more quickly, andthe corresponding time of the specific washing course to be reduced.

In the step and scrub motions, the laundry is dropped and the droppingshock is applied to the laundry, while the rotation and stopping of thedrum may generate a strong vortex in the wash water.

Additionally, a circulating step configured to circulate the wash waterheld in the tub and to re-supply the wash water to the drum may beimplemented in the detergent dissolution promoting step. In thecirculating step, the wash water held below the drum is supplied to theinside of the drum, further promoting detergent dissolution and laundrywetting.

In certain embodiments, the detergent dissolution promoting step may beimplemented for, for example, approximately 2 minutes, or other amountof time as appropriate, until the water supplying is completed. Thewater supplying may be completed in the detergent dissolution promotingstep or water may be additionally supplied because a water level may bedecreased in a following laundry wetting step. The detergent dissolutionpromoting step may be implemented for a relatively short time so as tonot significantly impact laundry fabric damage. As a result, a drumdriving motion in the detergent dissolution promoting step of each abovecourse may be the scrub motion, depending on an amount of laundry in thedrum.

That is, the detergent dissolution promoting step may be implemented ifthe determined laundry amount is a predetermined level or lower, as thedrum driving motions configured to supply the strong mechanical forcemay be more effective with small amounts of laundry and because thesmall amounts of laundry may maintain sufficient contact with the washwater. Specifically, the small amount of laundry indicates that asurface area of the laundry which has to contact with the wash water issmall and that the detergent dissolution and laundry wetting may beimplemented by the mechanical force applied to turn over the laundry ina relatively short time. As a result, the step motion or the scrubmotion enables the efficiency of the washing to be improved and the timeof the washing time to be reduced accordingly.

In contrast, if the laundry amount determined in the laundry amountdetermining step is a predetermined level or higher, the detergentdissolution promoting step may be skipped. That is, if the amount of thelaundry is relatively large, the mechanical force is not enough for thelaundry to make sufficient contact with the wash water because washwater cannot be supplied to/absorbed by entangled laundry in asufficient amount.

As a result, if the laundry amount is a predetermined level or higher,the detergent dissolution promoting step is omitted and the laundrywetting step starts immediately. If the laundry amount is thepredetermined level or higher, the laundry may make better contact withthe wash water to promote the detergent dissolution using thecirculating step in the water supplying step.

A.1.2.3 Laundry Wetting (S736):

A step of sufficiently wetting the laundry with the wash water may beimplemented in the water supplying step, together with the detergentdissolution. In the case of a drum type washing machine, the laundry isnot necessarily fully submerged into the wash water, and thus laundrywetting may be implemented quickly in an initial stage of the washingcycle. After the detergent dissolution promoting step, a laundry-wettingpromoting step may be implemented to promote laundry wetting. This stepmay be implemented after the water supplying step is implemented to apredetermined degree or until the water supplying step is completed toensure that the laundry is sufficiently saturated. Alternatively, thedetergent dissolution promoting step may be implemented after the watersupplying is completed. The water level is decreased in the laundrywetting step and additional water supply may be implemented.

The laundry wetting step may be partially implemented in the detergentdissolution promoting step mentioned above and a water level may beincreased enough to allow wash water to be collected inside the drum.Because of that, the step of promoting the laundry wetting may beimplemented after the detergent dissolution promoting step. A drumdriving motion of the laundry wetting promoting step may be controlleddifferently in comparison to that of the detergent dissolution promotingstep. For example, the drum driving motion of the laundry wettingpromoting step may include a rolling motion and/or a filtration motion.In certain embodiments, the filtration motion and the rolling motion maybe implemented sequentially.

The filtration motion is a motion in which the laundry is broadlydistributed to broaden the surface area of the laundry, and thus thefiltration motion may be used to wet the laundry uniformly. The rollingmotion is a motion in which the laundry is repeatedly turned over tomake the wash water held under the drum contact the laundry uniformly,and the rolling motion may also be applied in laundry wetting. Toutilize these effects as much as possible, different drum drivingmotions, that is, repeated/sequential implementation of the filtrationand rolling motions in a predetermined order may maximize effect of thelaundry wetting promoting step.

If the laundry amount is a predetermined level or higher, the drumdriving motion of the laundry wetting promoting step may include thefiltration motion. That is, in the filtration motion, the surface areaof the laundry is broadened and the wash water is supplied in thefiltration motion, and the laundry is distributed uniformly withoutbeing entangled and the wash water is supplied the laundry uniformly.Alternatively, or in addition to the filtration motion, the tumblingmotion may also be implemented.

If the laundry amount is lower than the predetermined level, afiltration and/or tumbling motion may be employed during the laundrywetting promotion step.

The user may select a contamination level of the laundry from the optionselecting part 118 and a net acting ratio of the motor may bedifferentiated according to this selection. However, the net actingratio in the water supplying step may not be differentiated according tothe selected contamination level, because the net acting ratio in thewater supplying step is preset to optimize detergent dissolution andlaundry wetting, and because concern of unnecessary damage to thelaundry cannot be ignored. If the net acting ratio is decreased, thedetergent dissolution and the laundry wetting cannot be sufficientlyimplemented.

The water supplying step in the standard course may include thedetergent type determining step, the detergent dissolution promotingstep and the laundry wetting promoting step described above. Inalternative embodiments, the detergent type determining step, thedetergent dissolution promoting step or the laundry wetting step may beprovided independent from the water supplying step. In this case, thedetergent determining step, the detergent dissolution promoting step orthe laundry wetting step may be implemented after the water supply iscompleted.

A.1.3 Heating (S740):

The washing cycle includes the washing step. To prepare for washing, aheating step may be implemented between the washing and the watersupplying steps.

The heating step may be configured to heat the wash water by using theheater provided under the tub or to increase the temperature of the washwater or the drum by using steam supplied to the inside of the drum.Because of that, the heating step may be implemented or omitted asnecessary. That is, if using cold air or water to treat the laundry, theheating step may not be implemented. However, if the temperature of thewash water is preset to be higher than the temperature of the cold waterbecause of a default temperature associated with a selected course, orif the temperature of the wash water is selected to be higher than thetemperature of the cold water from the option selecting part 118, theheating step may be implemented.

The drum driving motion in the heating step may be differentiatedaccording to the amount of the laundry. A tumble motion may beimplemented in the heating step regardless of the laundry amount.However, as mentioned above, if the laundry amount is the predeterminedlevel or lower, the rolling motion may be implemented in the heatingstep. That is, in case the laundry is relatively small, the repeatedturn-over of the laundry in the lower portion of the drum may be moreeffective in heating and washing than the distribution of the laundry.Alternatively, with a small amount of laundry in the heating step, acombination of the tumbling and rolling motions may be used, and with alarge amount of laundry, the tumble motion may be used.

The heating step may include a heating preparing step configured toprepare for heating after the water supplying step. This means that thewater supplying step is completed after completion of the laundrywetting. As a result, it is possible to determine the amount of laundrymore precisely after the water supplying step, because wet laundry itemscannot be distinguished from dry laundry items based on the laundryamount before the laundry wetting. For example, the amount of wetlaundry items may be determined larger than the actual amount, beforethe laundry wetting. As a result, in certain embodiments, a more preciselaundry amount determining step may be implemented in the heating step,before the washing. If the heating step is omitted, a step correspondingto the heating preparing step may be implemented to determine theprecise amount of the laundry. That is, if the heating step is omitted,the precise laundry amount determining step may be implemented beforethe washing step after the water supplying step is complemented.

A.1.4 Washing (S742):

Once the water supplying step and the heating step described above arecompleted, the washing step configured to wash the laundry may beimplemented. A drum driving motion in the washing step may be asequential combination of step and/or tumble and/or rolling motions toapply a strong mechanical force and move the laundry in diverse patternsto improve washing efficiency.

Alternatively, the drum driving motion in the washing step may be asequential combination of the filtration motion and the tumble motion tocontinuously supply wash water to the laundry to improve washingefficiency generated by the detergent as well as washing efficiencygenerated by the mechanical force applied to the laundry.

As a result, the drum driving motion in the washing step may bedifferentiated according to the laundry amount because the drum drivingmotion capable of generating an optimal washing effect may be differentdepending on the laundry amount. The laundry amount may be the laundryamount determined before the water supplying step or in the heatingstep.

In the washing step, the drum driving motion may be differentiatedaccording to the laundry amount determined after the water supplyingstep.

If the laundry amount is a predetermined level or higher, the drumdriving motion may include the filtration motion and/or the tumblemotion. If the washing machine is not equipped to circulate the washwater, only the tumble motion may be implemented. In the case of a largeamount of laundry, wash water may be supplied to the laundry uniformlyand the mechanical force may be applied to the laundry simultaneously toimprove washing efficiency.

If the laundry amount is a predetermined level or lower, the drumdriving motion may include a step motion and/or a rolling motion toimprove the washing efficiency as the laundry is moved in variouspatterns with the mechanical force applied to the laundry. In certainembodiments, the tumbling motion may also be implemented with the stepmotion and/or the rolling motion.

As mentioned above, in the standard course, the drum driving motion inthe water supplying step, the heating step and the washing step may bediversified and efficiency of the washing cycle may be improvedaccordingly. In addition, the drum driving motion in each of the stepsmay be differentiated according to the amount of laundry in the drum andthe optimized washing cycle may be implemented accordingly.

If the user selects a contamination level of the laundry from the optionselecting part 118, the net acting ratio of the heating step and thewashing step may be differentiated. If the net acting ratio isunnecessarily high in a case in which the contamination level isrelatively low, the laundry would be unnecessarily damaged.

A.2 Rinsing Cycle (S750):

A control method of a rinsing cycle in Course A will be described inreference to FIG. 7A. According to this embodiment, the rinsing cyclemay be implemented as a part of a single course, together with thewashing cycle described above, or it may be implemented independently.Simply for ease of discussion, a control method of the rinsing cycleimplemented after the washing cycle mentioned in the standard coursewill be described hereinafter.

A.2.1. First Rinsing (S751):

Once the washing cycle is completed, a first rinsing step configured tosupply water and to drive the drum to implement rinsing may beperformed.

One or more spinning steps may be implemented in the standard course ineach of the washing cycle, the rinsing cycle and the spinning cycle. Forexample, spinning after the washing cycle and spinning in the rinsingcycle may be implemented. These spinning steps may be referred to as‘intermediate-spinning’ to be distinguished from the spinning cyclewhich is the last cycle of the standard course.

A spinning level may be determined based on RPM of the drum. Typically,intermediate-spinning may be implemented at approximately 200 to 400RPM, and, for example, at approximately 400 RPM in a Sensitive Course,approximately 600 RPM in a Weak Course, approximately 800 RPM in aMiddle Course, and approximately 1000 RPM in a Strong Course. A drum RPMfor intermediate-spinning may be selected based on a low resonancefrequency and a high resonance frequency during operation depending onthe current operation parameters.

The resonance frequency is an eigen physical value of the washingmachine and the vibration of the washing machine is drasticallyincreased near the resonance frequency. If the drum is rotated near theresonance frequency and the laundry not distributed uniformly, thevibration of the washing machine will be increased very suddenly. As aresult, if spinning is implemented at a predetermined RPM higher thanthe resonance frequency, a laundry disentangling step would typically beimplemented to distribute the laundry uniformly inside the drum and thevibration is sensed. If the sensed vibration is less than apredetermined value, an accelerating step may be implemented to be outof a resonance frequency band.

As water supplying and rinsing are repeated more times in the rinsingcycle, the time required by the intermediate-spinning implemented in themiddle of the rinsings would be longer. To address concerns of residualdetergent remaining after washing is completed, the rinsing steps may beimplemented at least three times or more in the rinsing cycle.Intermediate-spinning implemented at this time may add a significantamount of time to the rinsing cycle, resulting in an excessively longrinsing cycle. According to this embodiment, the RPM in theintermediate-spinning implemented in the middle of the water supplyingand the rinsing may be differentiated. That is, the drum may be rotatedat a predetermined RPM lower than the low resonance frequency in apredetermined specific intermediate-spinning and at a predetermined RPMhigher than the high resonance frequency in another predeterminedspecific intermediate-spinning.

When the specific intermediate-spinning is implemented at an RPM lowerthan the low resonance frequency, the time required by an auxiliarylaundry disentangling step, vibration amount sensing step andaccelerating step may be unnecessary, thus potentially reducing the timerequired by the rinsing cycle. The RPM of this intermediate-spinning maybe set to be approximately 100 to 110. In contrast, if the specificintermediate-spinning is implemented at the RPM lower than the lowresonance frequency, the time required by the rinsing cycle may bereduced, but wash water including detergent may not be completelydischarged.

The most contaminants and detergent remnants may be found in the washwater after the washing cycle. Because of that, the wash water may bedischarged from the laundry as thoroughly as possible after the washingcycle.

A high speed spinning (S752) may be implemented in an initial stage ofthe first rinsing step, after the washing cycle in the standard course.In the high speed spinning, the drum may be rotated at a higher RPM thanthe high resonance frequency such that a maximum amount of wash watermay be discharged from the laundry. For example, the RPM may be set tobe approximately 1000 RPM. The high speed spinning step may continuouslyrotate the drum at the high speed, that is, approximately 1000 RPM,regardless of the user's selection, so that detergent remnants may bedischarged as thoroughly as possible before the rinsing.

Once the high speed spinning is completed, a first drum driving step(S753) may be implemented to drive the drum after water supplying torinse the laundry. A rinsing water level may be a relatively high levelallowing the water level to be visible through the door, so that thelaundry submerged into the wash water. Thus, a significant amount ofwash water may be supplied to rinse the laundry in an initial stage ofthe rinsing cycle.

A drum driving motion in the first drum driving step may be a scruband/or swing motion, to move the maximum amount of laundry submergedinto the wash water to improve rinsing performance. This scrub and swingmotions correspond to a process of continuously hand-scrubbing thelaundry under the wash water after submerging the laundry into the washwater. The tumbling and step motions correspond to a process ofrepeatedly moving the laundry into and out of the wash water. As aresult, the first drum driving step may control the drum to be driven inthe scrub and/or swing motion, with a high water level, allow the userto visually recognize that enough rinsing is implemented. In alternativeembodiments, a circulating step configured to circulate the wash waterheld in the tub into the drum may be implemented in the first drumdriving step. Wash water is sprayed into the drum to rinse the laundry.This process may be referred to as ‘spray rinsing’. This also displaysto a user, as it may be visible through the door, that enough rinsing isimplemented.

Once the first drum driving step is completed, a first draining andintermediate-spinning step (S754) may be implemented. During waterdraining, the drum may be driven in the step and/or tumbling motion. Thelaundry is lifted and dropped to improve washing efficiency and bubblesare generated to improve rinsing efficiency. The drum driving motion maybe differentiated according to the laundry amount. In the case of asmall amount of laundry, the drum is driven in the step motion togenerate the maximum distance between the lifting and the dropping. Inthe case of a large amount of laundry, the drum may be driven in thetumbling motion.

Intermediate-spinning may be implemented at approximately 100 to 110 RPMin the first draining and intermediate-spinning. Then, the laundrydisentangling step, the vibration sensing step and the accelerating stepmay be omitted and the required time may be noticeably reduced.

In alternative embodiments, in the first draining andintermediate-spinning step in a standard course, theintermediate-spinning may be implemented at approximately 400 RPM higherthan the low resonance frequency. In this case, the step and/or tumblingmotion may be implemented when water is drained and the laundry issufficiently distributed. Because of that, the laundry disentanglingstep may be omitted. Even at a rotation speed higher than the lowresonance frequency, the intermediate-spinning may be implemented for ashort time, with the vibration sensing step and the single acceleratingstep. Such intermediate-spinning may be implemented at a relatively highRPM to discharge detergent remnants and contaminants which fail to bedischarged via the high speed spinning step. However, in a case in whichthe amount of vibration measured in the vibration sensing step is out ofan allowable range, the vibration sensing step may be repeated so as tofail to enter into the accelerating step, and the rinsing time might beincreased disadvantageously. Because of that, the vibration sensing stepmay be implemented at the drum speed of approximately 100 to 110 RPM andin case the accelerating step fails to start within a predeterminedtimes of vibration step implementations, the first draining andintermediate-spinning step may finish.

A.2.2 Second Rinsing (S756) and Final Rinsing (S760):

A second rinsing step (S756) may follow the first rinsing step. Thesecond rinsing step may include a second drum driving step (S757) and asecond draining and intermediate-spinning step (S758).The second drumdriving step may be essentially the same as the first drum driving stepdescribed above. Also, the second draining and intermediate-spinningstep may be essentially the same as the first draining andintermediate-spinning step. However, intermediate-spinning isimplemented at approximately 100 to 110 RPM in the second draining andintermediate-spinning step to reduce the rinsing time, because detergentremnants have already been discharged in the high speed spinning stepand the first draining and intermediate-spinning step.

The rinsing cycle may make use of the result of the determination of thedetergent type determining step.

If the detergent is a liquid type, relatively little detergent mayremain and the second rinsing step may be omitted to reduce the timerequired by the rinsing cycle. If the detergent is a powder type, thefirst rinsing step and the second rinsing step may be performed bydefault.

If the detergent is a liquid type, a third rinsing step (S760) may serveas a final rinsing step after the first rinsing step. If the detergentis a powder type, a third rinsing step may serves as a final rinsingstep after the second rinsing step. However, when bubbles are sensed inthe third rinsing step (in the case of a powder type detergent), afourth rinsing step as final rising step may be implemented.

A water level of the final rinsing step (S760) may be a relatively lowlevel. In the case of a tilted drum type washing machine having a drumtilted at a predetermined angle, a water level may be a predeterminedlevel sufficient to supply water only to a predetermined rear portion ofthe tilted drum. That is, the water level may be such that it is notsensed, or visible, outside the washing machine. However, such a waterlevel is predetermined so as to not generate any more bubbles in thelaundry. Even if bubbles are generated, the bubbles are generated in thetub, not in the drum, to prevent excess accumulation. As a result, theuser may visually identify that no bubbles are generated in the finalrinsing step and rinsing performance satisfaction may be improved.

A third draining step (S762) may be implemented after the third drumdriving step (S761) in the final rinsing step, to implement the spinningcycle. The drum may be driven in the step and/or scrub motion todistribute the laundry uniformly in the third draining step.

A.3 Spinning Cycle (S770):

A control method of the spinning cycle in the standard course will bedescribed in reference to FIG. 7A. The spinning cycle may be implementedas a part of the standard course, together with the washing cycle andthe rinsing cycle, or independently as a single course. Simply for easeof discussion, a control method of the spinning cycle implemented afterthe washing cycle and the rising cycle composing the standard coursewill be described.

A.3.1 Laundry Disentangling (S771):

The spinning cycle may include a laundry disentangling step configuredto disentangle the laundry by driving the drum to distribute the laundryuniformly. The spinning cycle is provided to minimize the vibrationgenerated when the drum is rotated at a high speed. If the drum isdriven in the step and/or scrub motion in the draining step right beforethe spinning cycle, the laundry is likely to be disentangled to apredetermined degree by the step and/or scrub motion and the timerequired by the laundry disentangling step may be significantly reduced.

A.3.2 Eccentricity Measuring (S773):

After the laundry disentangling step, the amount of eccentricity withrotating the drum at a predetermined RPM lower than the low resonancefrequency for a predetermined time period, may be measured byaccelerating the drum and determine whether the laundry is uniformlydistributed inside the drum.

An eccentricity measuring step of a spinning cycle in a standard courseaccording to another embodiment may be implemented before a laundrydisentangling step. A significant amount of laundry disentangling mayhave been implemented by the drum driving motion of the rinsing cycle.As a result, the spinning cycle may start with the eccentricitymeasuring step to reduce the time of the spinning cycle. If the measuredeccentricity compared with a reference eccentricity value is determinedto be satisfactory, the accelerating, which will be described later, maybe implemented. If the measured eccentricity is unsatisfactory comparedwith the reference eccentricity value, the laundry disentangling stepmay be implemented. The drum may driven in the step motion in thelaundry disentangling step to promote the laundry disentangling and theeccentricity measuring step may re-start after the laundry disentanglingstep.

A.3.3 Accelerating and Normal Spinning (S775):

After the eccentricity measuring step, a step of accelerating therotation of the drum to a normal-spinning RPM (accelerating step) may beimplemented. After that, a normal-spinning step configured to rotate thedrum at the normal-spinning RPM may be implemented to complete thespinning cycle. The drum rotation speed of the normal spinning may bedefaulted to be approximately 1000 RPM. That is, the amount of themoisture contained in the laundry may be reduced as much as possible tominimize detergent remnants. The RPM of the normal-spinning may bechangeable according to the user's selection, because RPM of the normalspinning is related to a residual moisture level and wrinkle level ofthe laundry after the spinning cycle is completed. As a result, the usermay select and RPM of the normal spinning step, relating to a moisturelevel and a wrinkle-level of the laundry.

B. Course B (Heavy Contaminant Course):

A heavy contaminant course B in which heavy dirt is to be removed fromlaundry items will be described in reference to FIG. 8. The heavycontaminant course may be selected at the course selecting part 117(S810).

B.1 Washing Cycle (S830):

B.1.1. Determining Laundry Amount (S831):

Once the heavy contaminant course is selected, a laundry amountdetermining step may be implemented to determine the amount of laundryloaded into the drum. The method of determining the laundry amount maybe similar to that described above with respect to the standard course,and thus a repeated description thereof will be omitted accordingly. Thelaundry amount determining step could be implemented before the courseselecting step.

The control part compares the laundry amount determined in the laundryamount determining step with a reference value and controls drum drivingmotions of a water supplying step and a washing step, which will bedescribed later, based on the result of the comparison. Essentially, adetermined laundry amount greater than a reference value may beconsidered a large load, and a determined laundry amount less than thereference value may be considered a small load. Drum driving motions ofeach step according to the determined laundry amount will be described.

B.1.2 Water Supplying (S833):

In a water supplying step, the control part controls the water supplydevice (e.g. the water supply path and water supply valve) connectedwith the water supply source and the tub to supply the wash water to thetub. If the laundry amount measured in the laundry amount determiningstep is smaller than a reference value, the control part may control thedrum to be driven in the tumbling motion and/or the step motion and/orthe scrub motion and/or the filtration motion and/or the rolling motion.

First, if the laundry loaded into the drum is entangled, the eccentricrotation of the drum would be generated, and the control part maycontrol the drum to be driven in the tumbling motion in the watersupplying step to disentangle the laundry. In the tumbling motion, thedrum is rotated in a predetermined direction and the laundry is droppedto the lowest point of the drum from an approximately 90° or moreposition with respect to the rotation direction of the drum, such thatthe entangled laundry may be disentangled and distributed uniformly.

The control part controls the drum to be rotated in the step motionand/or the scrub motion so that a dropping shock is applied to thelaundry loaded into the drum. The step motion and the scrub may beapplied to remove insoluble contaminants smoothly. As a result, once thedrum is driven in the step motion and/or the scrub motion, insolublecontaminants may be removed in the water supplying step, and reducedwashing time and improved washing efficiency may be achieved.

The water supplying step supplies wash water to the tub and wets thelaundry loaded into the drum, as mentioned above. Because of that, thecontrol part may drive the drum in the filtration motion after the stepmotion and/or the scrub motion to perform laundry wetting.

In addition, the control part may drive the drum in the rolling motionto dissolve detergent in the wash water in the water supplying step, inaddition to the rolling motion, to wet the laundry in the wash water,before the water supplying step is completed.

If the laundry amount is more than a reference value, the control partmay control the drum to be driven in the tumbling motion and/or thefiltration motion, in the water supplying step. If the laundry amount isrelatively large, specifically, more than the reference value, the drummotion configured to apply a sudden brake to the drum such as the stepmotion and/or the scrub motion may apply too much load on the motor. Byextension, the original effect of the step and/or scrub motion which isthe application of the dropping shock cannot be achieved. Thus, the stepand/or scrub motion are not implemented if a large amount of laundry isloaded in the drum. Also, if a large amount of laundry is loaded in thedrum, the laundry wetting effect generated by the rolling motion havingthe relatively low rotation speed cannot be effectively achieved, and soinstead the tumbling motion may be implemented for laundry wetting.Eventually, if the laundry amount is more than the reference value, thedrum may be driven in the tumbling and/or the filtration motion suchthat the effects of the laundry distribution, the insoluble contaminantremoval, the laundry wetting and the detergent dissolution mentionedabove may be achieved.

B.1.3 Washing (S835):

After the water supplying step is completed, a washing step of the heavycontaminant course may start. The washing step of the heavy contaminantcourse may include a soaking step, contaminant removing step and aremaining-contaminant removing step. In this case, wash water havingdifferent temperatures may be supplied in each step and each step may beimplemented accordingly.

B.1.3.1 Soaking (S836):

The soaking step is a process of soaking the laundry in cold water toloosen heavy contaminants contained in the laundry. Relatively coolwater having a temperature of, for example, approximately 15° C. is usedin the soaking step, to loosen protein components contained in the heavycontaminants attached to the laundry for a long time. If these proteincomponents contact heated water, these heavy contaminants tend to befixedly solidified in the laundry and it is difficult to separate themfrom the laundry. Because of that, the soaking step may be implementedusing cold water, to prevent the heavy contaminants having the proteincomponents from being fixed to the laundry.

If the laundry amount is less than a predetermined value, the motor maydrive the drum in the step motion. The tumbling motion and/or therolling motion may be added after the step motion. Since the step motionhas excellent washing ability and reduced washing time, the heavycontaminants attached to the laundry may be soaked and a shock isapplied to the laundry. As a result, the step motion has an effect ofinducing separation of the heavy contaminants from the laundry.

If the laundry amount is more than the reference value, the drum may bedriven in the tumbling motion and/or the rolling motion in the soakingstep. That is, if the measured laundry amount is more than apredetermined reference value, the step motion may not be implementeddue to the excessive load that would be applied to the motor. As notedabove, the step motion applies a dropping shock to the laundry insidethe drum and to improve washing efficiency. However, if the laundryamount is large the step motion may not be implemented. When the laundryamount is more than the reference value, the step motion is also notimplemented in the contaminant removing and the remaining contaminantremoving steps, which will be described later.

B.1.3.2 Contaminant Removing (S837):

After the soaking step, a contaminant removing step configured to heatwash water in a range of 35° C. to 40° C. to remove heavy contaminantsmay start. The temperature of the wash water used in the contaminantremoving step is set be between 35° C. to 40° C. because sebumcomponents contained in the heavy contaminants may be removed moreeasily at a temperature that is similar to a human body temperature. Theheater provided in the bottom surface of the tub or the moisturesupplying device configured to supply heated-moisture such as steam tothe tub may be used to increase the temperature of the wash water up towithin the predetermined range.

In the contaminant removing step, the control part may control the motorto drive the drum in the tumbling motion and/or the rolling motion ifthe laundry amount is the reference value or less. The tumbling motionand/or the rolling motion may apply low load on the motor and reduce thewashing time, with high washing efficiency. Because of that, reducedwashing time may be achieved.

If the laundry amount is more than the reference value, the control partmay control the drum to be driven in the tumbling motion. In case of alarge amount of laundry, the rolling motion configured to rotate thedrum at the relatively low speed may not be effective in contaminantremoval, and thus the tumbling motion may be applied.

B.1.3.3 Remaining-Contaminant Removing (S838):

The control part may implement a remaining-contaminant removing stepconfigured to heat the wash water to have the temperature ofapproximately 60° C. and to sterilize and bleach the laundry, after thecontaminant removing step. The temperature of the wash water may beapproximately 60° C. or higher in the remaining-contaminant removingstep to sterilize and bleach the laundry.

In the remaining-contaminant removing step, the control part may controlthe drum to be driven in the step motion or in the order of the stepmotion and/or tumbling motion and/or rolling motion, if the laundryamount is less than the reference value.

If the laundry amount is more than the reference value, the control partmay control the drum to be driven in the filtration motion and/or thetumbling motion in the remaining-contaminant removing step.

B.2 Rinsing Cycle (S850):

The rinsing cycle of the heavy contaminant course may be similar to therinsing cycle of the standard course described above and rinsing cyclesof the other courses which will be described later. Thus, repeateddescription of the rinsing cycle will be omitted.

B.3. Spinning Cycle (S870):

The spinning cycle of the heavy contaminant course may be similar to thespinning cycle of the standard course described above and spinningcycles of the other courses which will be described later. Thus,repeated description of the spinning cycle will be omitted.

C. Course C (Quick Boiling Course):

Course C will be described in reference to FIG. 9. Course C may bereferred to as ‘quick boiling course’ configured to heat the wash waterto a predetermined temperature for a relatively short time to achieve aneffect of laundry sanitary boiling, such as in a sanitization cycle.

Typically, when sterilizing and bleaching laundry, the wash water heldin the tub is heated to a preset ‘set temperature’ and then washing isimplemented. Since the washing time is relatively long and the electricpower consumed quite a lot to heat the wash water only, it takes quite along time and much electric power to heat the wash water held in the tubto the preset temperature. In the quick boiling course the laundry maybe sterilized and bleached while also reducing the overall washing timeand the power consumption. The quick boiling course heats the wash watersupplied to the tub for a preset time period, regardless of thetemperature of the wash water, instead of heating the wash water untilthe wash water reaches the preset temperature. To take the washingability into consideration, a step of compensating the time of a washingstep provided in the quick boiling course according to the temperatureof the wash water may be included in this washing course, as will bedescribed in reference to FIG. 9.

First, the user may select the quick boiling course from the courseselecting part 117 (S910). Then, the control part implements a step ofsetting the time of the washing step of the quick boiling course. Thiswashing time setting step allows the control part to determine the timerequired by the washing step of the quick boiling course, which isstored in a storage device, such as a memory. This step may beimplemented simultaneously with the course selecting step or a watersupplying step.

C.1 Washing Cycle (S930):

C.1.1 Determining Laundry Amount and Washing Time Setting (S931):

Once the user selects the quick boiling course, the control part mayimplement a laundry amount determining step configured to measure theamount of the laundry and a washing time setting step configured to setthe time required by a washing step of the quick boiling course based onthe determined laundry amount. The control part may use the time takento rotate the drum to a predetermined position to determine the laundryamount, as described above, or the time of residual rotation afterrotating the drum for a predetermined time.

In the washing time setting step, the control part may select a washingtime corresponding to the measured laundry amount from proper timesstored in the memory. The variety of the time required by the washingstep of the quick boiling course is stored in the storage device, suchas memory, so that, when the quick boiling course is selected, a propertime stored in the memory may be selected by the control part.

C.1.2 Water Supplying (S933):

The washing cycle of the quick boiling course may include a watersupplying step configured to supply wash water to the tub. In the watersupplying step, the control part controls the water supplying device(e.g. water supplying path and water supplying valve) connected with thewater supply source and the tub to supply water to the tub. Also, thecontrol part controls the drum to be driven in a similar drum drivingmotion to the drum driving motion of the water supplying step of, forexample, the heavy contaminant course described above, and thus furtherdetailed description will be omitted.

C.1.3 Water Temperature Measuring Step/Compensating (S935):

Once the water is supplied to the tub, the control part measures thetemperature of the wash water using temperature a temperature sensorprovided in the washing machine and compares the measured temperaturewith a reference temperature to adjust the time of the washing step.

For example, the control part may compare the measured temperature ofthe wash water to a reference temperature, for example, higher thanapproximately 50° C. If the measured temperature is higher than thereference temperature, for example, if heated-water is supplied to thetub, the control part may implement the washing step right away.However, if the measured temperature is lower than the referencetemperature, the control part may implement a compensating stepconfigured to adjust the time of the washing step.

As mentioned above, the washing step may be implemented after heatingthe wash water for the predetermined time period in this course,regardless of the water temperature. Because of that, the temperature ofthe wash water held in the tub may be different, depending on thetemperature of the water supplied to the tub after a heating step iscompleted, and there would be difference in washing ability due to thedifference in water temperature. As a result, the compensating step isprovided to minimize the difference in the washing ability caused by thewash water having different temperatures after the heating step. If thetemperature of the wash water is lower than the reference temperature,the time of the washing step is increased to compensate for the washingability at the lower temperature.

The number of reference temperatures used to define a temperature rangemay be adjustable appropriately. For example, in one embodiment, asingle reference temperature may be provided, and in alternativeembodiments, a plurality of the reference temperatures may be provided.When the temperature of the wash water is higher than a first referencetemperature (e.g. 50° C.) and there are three reference temperatures,that is, first, second and third reference temperature are provided, thecontrol part may implement the washing step immediately. When themeasured temperature of the wash water is lower than the first referencetemperature and higher than the second reference temperature, the secondreference temperature (e.g., 40° C.), being lower than the firstreference temperature (e.g. 50° C.), and when the measured temperatureis lower than the second reference temperature and higher than the thirdreference temperature, the third reference temperature (e.g. 30° C.)being lower than the second reference temperature (e.g. 40° C.), andwhen the measured temperature is lower than the third referencetemperature, the compensating step configured to compensate the time ofthe washing step preset in the washing time setting step is performed.

When the time of the washing step is compensated, the control part maycontrol the compensated time to be different depending on thetemperature of the wash water. The washing ability is substantially inproportion to the temperature of the wash water. Because of that, thelower the measured temperature of the wash water is, the longer thecompensated time is. The reference temperature and the range of the timeadded in the compensating step may be preset based on the capacity ofthe washing machine and other such factors.

C.1.4 Heating (S937):

Once the preset time of the washing step is compensated in thecompensating step, a heating step configured to remove contaminantscontained in the laundry by way of drum motion and to heat the washwater simultaneously may be implemented for a predetermined time period.The heating step may be implemented as an independent step or as a partof a washing step to be described later. Simply for ease of discussion,in this course description, the heating step will be described as thepart of the washing step.

C.1.5 Washing (S939):

A drum driving motion of the washing step of the quick boiling coursemay include the step motion and/or the tumbling motion and/or therolling motion.

The step motion has excellent washing ability and applies the shock tothe laundry such that contaminants attached to the laundry may beseparated and washing time may be reduced. As a result, the control partmay rotate the drum in the step motion in an initial stage of thewashing step. In this case, the heating step may be implemented afterthe step motion of the washing step.

In the step motion, the drum is rotated at a predetermined speedallowing the laundry not to be dropped from the inner circumferentialsurface of the drum due to the centrifugal force. When the laundry islocated near the highest point of the drum, a reverse-torque is appliedto the drum. Since the net acting ratio of the step motion is adjusted,the load applied to the motor is larger in the step motion than in theother motions. Because of that, if the heating step configured to heatthe wash water is continued during the step motion, power consumptionwould be increased and a safety problem could occur due to the increasein the current amount. As a result, the heating step may be implementedfor a predetermined time after the step motion is completed.

The heating step is configured such that the heater is not driven for apreset heating time period, and not necessarily until the temperature ofthe wash water reaches the preset value. This allows the time andelectric power required by the washing step to be predicted accuratelyand the user to be notified of the predicted data. In addition, thewashing step may be implemented only for essentially the same presettime, regardless of the temperature of the wash water supplied in thewashing step, such that power consumption and washing time may bereduced.

Hence, the control part may control the tumbling motion and/or therolling motion to be implemented. In this case, the tumbling motionand/or the rolling motion may be implemented simultaneously with thestart of the heating step. The tumbling motion and the rolling motionapply a low load to the motor and have good washing ability, withreduced washing time. As a result, the tumbling motion and the rollingmotion may achieve an effect of reducing the washing time required bythe washing step and an effect of a proper washing ability even with thewashing step implemented using the wash water having differenttemperatures.

C.2 Rinsing Cycle (S950):

A rinsing cycle of the quick boiling course may be similar to therinsing cycles of the courses described above and rinsing cycles ofother courses to be described later. Thus, further detailed descriptionthereof will be omitted.

C.3 Spinning Cycle (S970):

A spinning cycle of the quick boiling course may be similar to thespinning cycles of the courses described above and spinning cycles ofthe other courses which will be described later. Thus, further detaileddescription thereof will be omitted.

D. Course D (Cool Wash Course):

A Cool Wash Course D will be described in reference to FIG. 10. The CoolWash Course D is configured to wash laundry without heating wash water,providing energy savings without degrading a desired washing ability. Asa result, this course measures the temperature of the wash watersupplied to the tub, the measured temperature is compared with a presettemperature, and operation parameters are adjusted accordingly, enablingthe washing ability maintained. For example, if the temperature of thewash water does not reach a reference temperature based on the result ofthe comparison, the washing time is compensated enough to provide atarget washing ability in the cool wash course.

First, the user may select the cool wash course from the courseselecting part 117 (S1010). Once the user selects the cool wash course,the control part may implement a washing cycle, a rinsing cycle and/orspinning cycle sequentially or selectively.

D.1 Washing Cycle (First Embodiment) (S1030):

D.1. Determining Laundry Amount/Washing Time Setting (S1031):

Once the user selects the cool wash course, the control part mayimplement a laundry amount determining step configured to measure theamount of the laundry and a washing time setting step configured to setthe time required by a washing step of the cool wash course based on themeasured amount of the laundry. In the laundry amount determining step,the control part may use the time taken to rotate the drum to apredetermined position or the time of residual rotation of the drum, tomeasure the amount of the laundry, as described above. In the washingtime setting step, the control part may select a washing timecorresponding to the measured laundry amount from proper times stored inthe memory according to the laundry amount.

D.1.2 Water Supplying (S1033):

The washing cycle of the cool wash course may include a water supplyingstep configured to supply wash water to the tub. In the water supplyingstep, the control part controls the water supplying device (e.g. watersupplying path and water supplying valve) connected with the watersupply source and the tub to supply water to the tub. Also, the controlpart controls the drum to be driven in a similar drum driving motion tothe drum driving motion of the water supplying step of the heavycontaminant course or the quick boiling course described above. Thus,further detailed description thereof will be omitted.

D.1.3 Water Temperature Measuring/Washing Time Compensating (S1035):

Once the wash water is supplied to the tub, the control part may measurethe temperature of the wash water using a temperature measuring deviceprovided in the washing machine. The control part may compare themeasured temperature with a reference temperature (e.g. 15° C.). If themeasured temperature of the wash water is the reference temperature ormore, the control part may implement the washing step withoutcompensating the washing time according to the laundry amount. If themeasured temperature is less than the reference temperature, the controlpart may implement the washing time compensating step. In this example,the temperature of ‘15° C.’ is presented as an example of a criticaltemperature capable of securing a washing ability in cool-washing and areference temperature of a washing ability test using cool water. As aresult, if the measured temperature of the wash water is less than thereference temperature, the control part may adjust the time of thewashing step set in the washing time setting step. For example, if themeasured temperature is less than the reference temperature, the controlpart may add a predetermined time to the time of the washing step toprevent deterioration of the washing ability due to the use of cool washwater having a lower temperature than the reference value.. For example,if the measured temperature of the wash water is less than approximately10° C., 10 minutes may be added to the time of the washing step in thewashing time compensating step. If, for example, the measuredtemperature is more than 10° C. and less than 15° C., 5 minutes maybeadded to the time of the washing step.

D.1.4 Washing (S1037):

Once the time of the washing step is compensated, the laundry amountmeasured in the laundry amount determining step mentioned above iscompared with a reference laundry amount value and a washing stepincluding different drum driving motions implemented according to thelaundry amount may be implemented. The reference laundry amount valuemay be preset based on an amount of laundry that allows the step motionto be performed, taking into consideration of the size of the drum andthe output of the motor. For example, the reference laundry amount valuemay be a half value of the washing capacity of the washing machine(approximately 5˜6 Kg in a washing machine having an 11 Kg capacity). Acase in which the measured laundry amount value is less than thereference laundry amount value will be described first, and then a casein which the measured value is the reference value or more will bedescribed.

When the measured laundry amount value is less than the referencelaundry amount value, the control part controls the step motion and/orthe tumbling motion and/or the rolling motion to be implemented in thewashing step. The step motion applies the dropping shock to the laundryloaded into the drum and contaminants contained in the laundry may beremoved easily, even if cold water is used. If the laundry is entangledduring the washing step, eccentric rotation of the drum may begenerated. Thus, the control part drives the drum in the tumbling motionand/or rolling motion to disentangle and distribute the entangledlaundry.

When the measured laundry amount value is the reference value or more,the control part controls the filtration motion and/or the tumblingmotion to be implemented in the washing step. If the laundry amount isthe reference value or more, the large load amount makes it difficult toachieve the effect of applying the shock to the laundry in the stepmotion and the effect of rolling the laundry along the innercircumferential surface of the drum in the rolling motion. Because ofthat, the filtration motion and the tumbling motion may be implemented,individually or sequentially, to achieve the effect of securing thewashing ability and the effect of laundry distribution.

D.1′ Washing Cycle (Second Embodiment) (S1130):

FIG. 11 is a diagram of a cool wash course according to a secondembodiment as broadly described herein.

Compared with the cool wash course according to the first embodiment,the cool wash course according to the second embodiment omits a washingtime setting step and a compensating step and instead heats the washwater using the heater if the temperature of the wash water is lowerthan 15° C. That is, in a washing cycle according to the secondembodiment, the laundry amount is determined (S1131) and a watersupplying step (S1133) may be implemented immediately without settingthe washing time. After that, the temperature of the wash water ismeasured (S1135) to implement the washing step (S1137). A drum drivingmotion of the drum may be differentiated according to the laundry amountin the washing step according to the second embodiment, which is similarto the first embodiment described above. The washing step according tothe second embodiment may further include a heating step based on themeasured temperature of the wash water.

A case in which the laundry amount measured in the washing step is lessthan the reference value will be described, in which the drum drivingmotion of the drum includes the step motion and/or tumbling motionand/or rolling motion.

When the measured temperature of the wash water is less than thereference value, the step motion is implemented after the washing stepstarts. After the step motion, a heating step configured to heat thewash water using a heater or a moisture supplying device provided in thetub may be implemented. The heating step starts after the step motionbecause the step motion applies increased load to the motor, asmentioned above. Thus, a safety problem as well as washing abilitydeterioration may occur if the heating step and the step motion areimplemented simultaneously. Also, if the heating step is implementedbefore the step motion to avoid the above problems, the washing timewould be increased disadvantageously. Thus, in this embodiment theheating step starts after the step motion is completed.

At the moment when starting the heating step, the control part mayimplement the tumbling motion and the rolling motion sequentially. Thetumbling motion and the rolling motion have no concern in deteriorationof washing ability deterioration and safety and can reduce washing time,even if they are implemented together with the heating stepsimultaneously.

The temperature of the wash water is re-measured after the heating stepand it is determined whether the re-measured temperature reaches thereference temperature. When the temperature of the wash water reachesthe reference temperature, the heating step may finish. However, if thetemperature of the wash water fails to reach the reference temperature,the heating step may be continued during the washing step. That is, evenif the temperature of the wash water heated in the heating step fails toreach the reference temperature, if the washing step finishes then theheating step finishes as well.

If the measured temperature is the reference temperature or more, thecontrol part drives the drum in the step motion and/or the tumblingmotion and/or the rolling motion essentially the same as the descriptionof the drum driving motion according to the first embodiment, and thusfurther description thereof will be omitted accordingly.

If the laundry amount is the reference value or more in the washingstep, the control part may drive the drum in the filtration motionand/or the tumbling motion. At this time, the heating step may beprovided in case the measured temperature of the wash water is less thanthe reference temperature. As described above, the drum is not driven inthe step motion during the heating step.

D. 1″ Washing Cycle (Third Embodiment) (S1230):

FIG. 12 is a diagram of a cool wash course according to a thirdembodiment as broadly described herein.

Compared with the cool wash course according to the first embodimentdescribed above, the cool wash course according to the third embodimentsupplies warm water to the tub if the temperature of wash water suppliedin a water supplying step is lower than approximately 15° C. That is,after determining the amount of the laundry (S1231), the control partmay implement a water supplying step (S1233) configured to supply washwater to the tub based on the determined laundry amount, omitting awashing time setting time and a compensating step.

At the moment when implementing the water supplying step, the controlpart supplies cold water to the tub (1234) and may also implement awater temperature measuring step (S1235) and the cold water supplyingsimultaneously. In this case, when the measured temperature of the washwater is 15° C. or higher, a washing step (S1240) may be implementedaccording to the amount of the laundry loaded into the drum. If themeasured temperature is lower than 15° C., a warm water supplying step(S1236) may be implemented.

The water supplying step may be continued until the amount of the coldwater and the amount of the warm water supplied in the water supplyingstep reaches the amount of wash water determined according to thelaundry amount. Once the water supplying step is completed, a washingstep implemented according to the laundry amount may start. The drumdriving motion may be differentiated according the laundry amount in thewashing step, like the first embodiment described above, and thusfurther detailed description thereof will be omitted.

D.2 Rinsing Cycle (S1050, S1150, S1250):

A rinsing cycle of the cool wash course may be similar to the rinsingcycles of the courses described above and rinsing cycles of the othercourses to be described later. As a result, further detailed descriptionthereof will be omitted.

D.3 Spinning Cycle (S1070, S1170, S1270):

A spinning cycle of the cool wash course may be similar to the spinningcycles of the courses described above and spinning cycles of the othercourses which will be described later. As a result, further detaileddescription thereof will be omitted.

E. Course E (Color Item Course):

Course E will be described in reference to FIG. 13. Course E may bereferred to as a ‘Color Item Course’ configured to wash colored laundryitems more efficiently. When washing colored laundry items, a colormigration problem, which can generate color running between coloreditems, fading, a lint problem and a pilling problem may occur. The abovecolor migration is likely to be generated as the static friction betweenthe drum and the laundry is larger. This course may include atemperature controlling step configured to prevent color migration bycontrolling the temperature of wash water, a colored-item washing stepconfigured to drive the drum to prevent lint and pilling, and a rinsingstep. As follows, the steps will be described in detail.

E.1 Washing Cycle (First Embodiment) (S1330):

E.1.1 Water Supplying (S1331):

In a water supplying step, the control part controls cold water to besupplied to the tub. Color migration is more likely to occur in highertemperature wash water. In the water supplying step, the control partmay control the motor to drive the drum in the swing motion or thefiltration motion or a combination thereof. The water supplying step mayprovided to supply wash water required to wash the laundry to the tuband to wet the laundry loaded into the drum in the wash water. As aresult, the drum is driven in the filtration motion in the watersupplying step such that laundry wetting may be efficiently implemented.In addition, the drum may be driven in the swing motion in the watersupplying step, rather than the filtration motion. The swing motion canminimize the movement of the laundry inside the drum, compared with theother motions, to minimize lint generation and pilling which might begenerated by the friction force between the laundry items.

E.1.2 Water Temperature Measuring Step/Heating (S1333):

Once the water supplying step is completed, the control part may measurethe temperature of the wash water supplied to the tub. When the measuredtemperature is a reference temperature or more (e.g. 30° C. or 40° C.),the control part may start the washing step immediately. When themeasured temperature is less than the reference temperature (e.g. coldwater because the wash water supplied in the water supplying step iscold water), the control part may start a heating step configured toheat the wash water. In certain embodiments, the temperature (referencetemperature) of the wash water allowing the washing step to start may beset to be 30° C. or 40° C., because the temperature of the wash watercapable of maximizing washing ability, while minimizing color migrationis in a range of 30° C. to 40° C.

The heating step heats the wash water supplied to the tub using a heaterprovided in the bottom surface of the tub or a steam generating deviceconfigured to supply steam to the tub.

E.1.3 Washing (S1335):

When the heating step enables the temperature of the wash water to reachthe reference temperature (30° C. or 40° C.), the control part may starta washing step. In the washing step, the control part may control thedrum to be driven in a drum driving motion which can minimize themechanical friction force to prevent the lint and pilling and to achievethe desired washing ability. For example, the control part may controlthe drum to be driven in the swing motion and/or the step motion, in thewashing step of this course. Such the step motion and the swing motionmay be implemented sequentially and the sequential implementation may berepeated.

The swing motion rotates the drum in both opposite directions and dropsthe laundry from a position of approximately 90° or less with respect tothe rotation direction of the drum. The swing motion applies rheostaticbraking to the motor, because the physical friction applied to thelaundry can be reduced as much as possible, while maintaining apredetermined level of washing efficiency. As a result, the possibilityof lint and pilling, which may be generated by friction between thelaundry items or between the laundry and the drum, may be minimized.

As mentioned above, the step motion rotates the drum at thepredetermined speed allowing the laundry not dropped from the innercircumferential surface of the drum by the centrifugal force and then itapplies the sudden brake to the drum to maximize the shock applied tothe laundry. Because of that, the step motion has excellent washingability, and enough to compensate for an insufficient washing ability ofthe swing motion. The amount of time the step motion is performed may beshorter than the amount of time the swing motion is performed tominimize the possibility of lint and pilling.

E.1′ Washing Cycle (Second Embodiment) (S1430):

FIG. 14 is a diagram of a color item course according to a secondembodiment. Different from the above course according to the firstembodiment, the color item course according to the second embodimentallows a water temperature measuring step and a heating step to beimplemented in a washing step (S1433) after a water supplying step(S1431). If the water temperature measuring step and the heating stepare implemented before the washing step, the washing time would beincreased disadvantageously. As a result, this embodiment presents acolor item course capable of reducing the washing time in comparison tothe above embodiment.

After the water supplying step (S1431), the control part may control thedrum to be driven in the step motion and/or swing motion in the washingstep and it may determined whether the temperature of wash water is areference temperature (e.g. 30° C. or 40° C.) or more simultaneously.When the temperature of the wash water is the reference temperature ormore based on the result of the determination, the control part controlsthe drum to be driven continuously according to the washing step. Whenthe temperature of the wash water is less than the referencetemperature, the control part may start a heating step configured toheat the wash water.

The control part may control the drum not to be driven in the stepmotion in the heating step. That is, in the heating step, the controlpart drives the drum in the swing motion, not in the step motion. Thereason why the heating step is not implemented together with the stepmotion simultaneously is described in the above courses and thus furtherdetailed explanation will be omitted.

E.2 Rinsing Cycle (S1450):

The control part may start a rinsing cycle after the washing cycle iscompleted. The control part may control the drum to be driven in thefiltration motion during the rinsing cycle. The filtration motionrotates the drum at the predetermined speed allowing the laundry notdropped from the inner circumferential surface of the drum by thecentrifugal force and then sprays wash water into the drum such that thefiltration motion may be applied to wet or rinse the laundry. Also, thefiltration motion may generate little friction between laundry items andbetween the laundry and the drum. Because of that, the filtration motionallows the laundry to be rinsed in a relatively short time. The controlpart may implement the tumbling motion in the rinsing cycle tosupplement the rinsing ability of the filtration motion.

E.3 Spinning Cycle (S1470):

After the rinsing cycle is completed, a spinning cycle configured toremove wash water from the laundry may start. The spinning cycle of thecolor item course may be similar to the spinning cycles of the coursesdescribed above and spinning cycles of the other courses to be describedlater and thus further detailed description thereof will be omitted.

F. Course F (Functional Cloting Course)

Course F will be described in reference to FIG. 15. Course F may bereferred to as a ‘functional clothing course’ configured to washfunctional clothing, including outdoor clothing such asmountain-climbing clothes and other athletic wear, effectively, withoutfabric damage. Functional clothing is manufactured to be appropriate foroutdoor activities such as mountain-climbing, swimming, cycling and thelike. Functional clothes absorb sweat quickly and discharge the absorbedmoisture outside, and they help maintain body heat. However, thesefunctional clothes are made of thin synthetic fabric and are morefragile than other kinds of fabrics. A washing course for functionalclothes may be optimized to be proper for functional clothes.

First, the user may select the functional clothing course from thecourse selecting part 117 (S1510). Once the user selects the functionalclothing course, the control part may start a washing cycle, a rinsingcycle and/or a spinning cycle sequentially or selectively.

F.1 Washing Cycle (S1530):

F.1.1 Water Supplying (S1531):

The control part implements a water supplying step of a washing cycle.The water supplying step supplies wash water required to wash thelaundry. Also, the water supplying step dissolves detergent in thesupplied wash water and wets the laundry loaded into the drum.

F.1.1.1 First Water Supply (S1533):

The water supplying step includes a first water supplying stepimplemented for a predetermined time period. In the first watersupplying step, the drum may be driven in the swing motion. As mentionedabove, the swing motion rotates the drum in a predetermined directionand a reverse direction alternatively. After being rotated to 90° orless from the lowest point of the drum in the predetermined directionand the reverse direction, the laundry may be dropped. As a result, thealternative rotation of clockwise/counter-clockwise direction generatesa vortex in the wash water and detergent dissolution may be promoted. Atthe same time, the laundry rotated to 90° or less is dropped and a bigshock is not applied to the laundry. Because of that, the swing motionin the first water supplying step allows the detergent to be dissolvedin the wash water and a big shock is not applied to the functionalclothing. The swing motion may be repeated for a predetermined timeperiod, several numbers of times.

F.1.1.2 Second Water Supplying (S1535):

Once the first water supplying is completed, a second water supplyingmay be implemented for a predetermined time period. In the second watersupplying, wash water is continuously supplied and the filtration motionand the swing motion are sequentially implemented. The first and secondwater supplying steps may be classified according to a preset time. Thetime of each step may be adjustable according to the amount of thelaundry and other parameters as appropriate. For that, a laundry amountdetermining step configured to determine the amount of the laundry maybe provided before the water supplying step.

As mentioned above, the filtration motion rotates the drum at high speedto generate the centrifugal force and the laundry is in close contactwith the inner circumferential surface of the drum due to thecentrifugal force. Also, the wash water passes through the laundry andthe through holes of the drum by the centrifugal force and is dischargedto the tub. As a result, the laundry is wet by the wash water in thefiltration motion to be washed. In addition, the wash water passesthrough the laundry simply and the functional clothes may not be damagedwhile being wet in the wash water. After the filtration motion isimplemented for a predetermined time period, the swing motion may beimplemented. As mentioned above, the detergent may be continuouslydissolved, without damage to the functional clothes. The laundry may beeffectively wet in the wash water by the generated vortex and byextension, the swing motion generates the repeated drum rotation in theclockwise/counter-clockwise direction. Because of that, the entangledlaundry may be disentangled before being washed. In addition, the swingmotion drops the laundry from a relatively low position and fabricdamage of the laundry may be minimized while disentangling the laundry.As a result, the combination of the filtration and swing motions mayminimize damage of the functional clothes and enable laundry wetting,detergent dissolution and laundry disentangling to be achievedeffectively. Such the sequential combination of the filtration and swingmotions may be repeated several numbers of times for a predeterminedtime period.

F.1.2 Washing (S1540):

Once the wash water is supplied to a predetermined water level, thewater supplying step is completed and then a washing step may start. Asthe functional clothes are relatively light and thin, essentially thesame washing step may be implemented, regardless of the amount oflaundry in the drum.

F.1.2.1. First Washing (S1541):

The washing step may include a first washing step implemented for apredetermined time period, with the drum driven in the step motion. Asmentioned above, the step motion drops the laundry from the highestposition. As a result, the step motion in the first washing step mixesthe laundry items uniformly and the wash water preliminarily. Also, thestep motion soaks contaminants of the laundry and applies the shock tothe laundry to separate the contaminants from the laundry by using thebig rotation/dropping of the laundry.

F.1.2.2. Second Washing (S1543):

After the first washing step, a second washing step may be implementedfor a predetermined time period. In the second washing step, the washwater is heated for more effective washing and contaminant removal.First, the wash water may be heated by a heater provided in a bottomsurface of the tub or a steam generating device configured to supplysteam to the tub. Substantially, the wash water may be heated up toapproximately 25° C. to 30° C., preferably, approximately 27° C. in thesecond washing step. The functional clothes are made of thin syntheticfabric texture and they may be damaged if the temperature of the heatedwash water is excessively high. As a result, wash water having a propertemperature used in the second washing step may improve washingefficiency and may prevent fabric damage.

Simultaneously with the heating of the wash water, the drum may bedriven in the swing motion in the second washing step. The swing motionuses the drop of the laundry from the relatively low position and thealternative rotation of the drum. Because of that, the laundry may beswung gently and moved enough in the wash water. The wash water in theswing motion may be heated uniformly in a relatively short time and heatmay be transmitted to the laundry enough. Also, the swing motion cangenerate shock by the friction between the wash water and the laundryand dropping shock and it may remove contaminants effectively withoutfabric damage.

F.1.2.3. Third Washing (S1545):

After the second washing step, a third washing step may be implementedfor a predetermined time period. In the third washing step, anyremaining contaminants may be removed and a combination of the swing andstep motions may be implemented. Although the swing motion may removecontaminants without fabric damage as mentioned above, the washingability is relatively low in comparison to the other motions. As aresult, the step motion capable of applying the strongest shock is addedand the washing ability of the washing step mostly configured of theswing motion for the functional clothes may be improved. In addition,the strong shock of the step motion may prevent lint from being attachedto the laundry. As a result, the third washing step may minimize damageto the functional clothes and separate contaminants from the laundrycompletely and effectively.

F.2. Rinsing Cycle (S1550):

A rinsing cycle of the functional clothing course may be similar to therinsing cycles of the courses including the standard course mentionedabove and rinsing cycles of the other courses to be described later andthus further detailed description thereof will be omitted.

To reinforce the overall rinsing ability, the rinsing cycle may berepeated more often than the rinsing cycle of the standard course. Forexample, the rinsing cycle may be implemented at least three times ormore. This is because the drum is rotated at a lower RPM in a spinningcycle of the functional clothing course than in the standard course thusproviding weaker rinsing ability. That is, the spinning cycle separatesthe wash water from the laundry using the centrifugal force generated bythe high speed rotation of the drum and may provide a rinsing functionconfigured to separate detergent and contaminants together with the washwater from the laundry simultaneously. A normal spinning step of thespinning cycle of the functional clothing course uses a relatively lowRPM of the drum rotation and the final rinsing ability may be weakened.Thus, the rinsing step of the rinsing cycle of the functional clothingcourse may be implemented three times or more.

F.3 Spinning Cycle (S1570):

A spinning cycle of the functional clothing course may be similar to thespinning cycles of the courses including the standard course mentionedabove and spinning cycles of the other courses to be described later. Anormal spinning step of the spinning cycle may rotate the drum at alower RPM than the normal spinning step of the standard course, toprevent damage to the laundry.

G. Course G (Speed Wash Course):

A Speed Wash Course G, referred to as a ‘speed wash course’ capable ofwashing the laundry in a relatively short time, compared with the othercourses, will be described with respect to FIG. 7B. A small amount oflaundry typically requires a substantially short time in comparison to alarge amount of laundry. In the case of a small amount of laundry, anunnecessarily long amount of time may be taken to implement overallwashing. Because of that, a course used to wash a small amount oflaundry in a short amount of time may be provided. The speed wash courseis based on the standard course described above with respect to FIG. 7A,and each cycle or operational conditions of each step in the standardcourse may be optimized, or a predetermined number of steps may beomitted as appropriate.

First of all, the user may select the speed wash course from the courseselecting part 117 (S710B) and the control part may implement a washingcycle (S730B), a Rinsing Cycle (S750B), and a Spinning Cycle (S770)composing the speed wash course.

G.1 Washing Cycle:

G.1.1 Laundry Amount Determining:

The control part may start a laundry amount determining step todetermine the amount of laundry (S731B). The laundry amount determiningstep may be implemented before a water supplying step starts after theuser selects the speed wash course. The laundry amount measured in thelaundry amount determining step of the standard course as describedabove may be categorized into two categories, that is, a large amountand a small amount, to determine the following cycle or the drum motionof each step and other operational conditions. In the speed wash course,the measured laundry amount may be used to determined the total time ofthe overall washing, that is, the total time taken to complete thewashing, rinsing and spinning cycles as well. In this case, the laundryamount may be specified into more categories, for example, three or morecategories in the speed wash course. If the laundry amount is classifiedinto more categories, a different overall-washing time (that is, thetotal time taken to complete the washing, rinsing and spinning cycles)may be set for each of the categories of laundry amount. As a result,the overall washing time may be controlled corresponding to the amountof laundry. Because of that, a relatively short time may be properlyapplied to a small amount of laundry without deteriorating the actualwashing ability.

For example, the measured laundry amount may be classified into threecategories including first, second and third categories, or may beclassified into more than three categories. For example, the firstcategory correspond to a load of less than approximately 1.5 Kg and aproper washing time of the first category may be set to be approximately25 to 30 minutes, an in particular, 29 minutes. The second category maycorrespond to a load of approximately 1.5 to 4.0 Kg and a proper washingtime of the second category may be set to be approximately 35 to 40minutes, an in particular, 39 minutes. Lastly, the third category maycorrespond to a load of more than approximately 4.0 Kg and a properwashing time of the third category may be 45 to 50 minutes, and inparticular, 49 minutes. Such categories and times may be stored in thememory of the control part as table data.

Once the laundry amount is determined in the laundry amount determiningstep, the control part determines which category the measured laundryamount corresponds to, in reference to the stored category table. Afterthat, the control part may set the washing time given to the categorycorresponding to the measured laundry amount to be an actual washingtime.

G.1.2.Water Supplying/Heating/Washing:

After the above series of steps, the control part may sequentiallyimplement a water supplying step (S733B), a heating step (S740B) and awashing step (S742B) of the washing cycle (S730B). The water supplyingstep, the heating step, the washing step of the washing cycle of thespeed wash course are similar to those of the washing cycle of thestandard course shown in FIG. 7A and thus further detailed descriptionthereof will be omitted.

As mentioned above in the standard course shown in FIG. 7A, a heatingpreparing step configured to promote heating of wash water may beimplemented before a heating step. However, the heating preparing stepmay be a preliminary step and a drum motion of a predetermined timeperiod may increase the overall washing time. As a result, preliminarysteps such as the heating preparing step before the heating step may notbe implemented in the speed wash course. After the water supplyingcourse, the heating step may start.

G.2 Rinsing Cycle:

Once the washing cycle is completed, a rinsing cycle (S750B) configuredto remove detergent remnants and contaminants remaining in the laundrymay be implemented. The rinsing cycle (S750B) is similar to the rinsingcycle (S750) of the standard course shown in FIG. 7A and thus furtherdetailed description of the rinsing cycle will be omitted.

The first rinsing step implemented in the initial stage of the rinsingcycle of the standard course may include the first drum driving stepusing the filtration motion that requires much time. In contrast, thedrum motions implemented in the rinsing steps (S751B, S756B, S760B)require a relatively short time, while still providing the laundry withenough rinsing. As a result, the filtration motion of the first rinsingstep provided in the rinsing cycle of the speed wash course may beomitted to reduce the overall washing time.

G.3 Spinning Cycle:

Once the rinsing cycle is completed, the control part may start aspinning cycle (S770B). The spinning cycle of the speed wash course issimilar to the spinning cycle of the standard course shown in FIG. 7Aand thus further detailed description thereof will be omitted.

The laundry disentangling step implemented in the initial stage of thespinning cycle of the standard course implements a drum motion capableof disentangling the laundry. However, such a drum motion may not affectthe spinning ability substantially. Because of that, the laundrydisentangling step may not be implemented in the spinning cycle of thespeed wash course to reduce the overall washing time.

While the drum in the normal spinning step of the standard course may berotated at approximately 1000 RPM, the drum in a normal spinning step ofthe speed wash course may be rotated at approximately 800 RPM. As therotation speed of the drum increases, the vibration and noise of thedrum may get more severe and the preparing steps implemented for thedrum to reach the target RPM such as the eccentricity measuring step maybe repeated enough to require a relatively long operation time. As aresult, the target rotation speed of the speed wash course is lowered incomparison to that of the standard course and the time of the speedaccelerating may be prevented from being increased.

As mentioned above, the speed wash course may classify the laundryamounts into specific categories and it may set the overall washing timeproper to each category, such that the overall washing time of the largeamount of the laundry as well as the small amount of the laundry may bereduced properly. In addition, compared with the standard course,unnecessary steps may be omitted from the cycles to reduce the overallwashing time. Nevertheless, most of the drum motions applied to thecycles of the standard course are adapted in the speed wash course andthe desired washing ability may be achieved. As a result, the speed washcourse may wash a small amount of the laundry in a short time, whilemaintaining washing ability.

H. Course H (Silent Course):

Course H will be described in reference to FIG. 16. Course H may bereferred to as a ‘silent course’ capable of reducing noise duringwashing.

In certain circumstances, less noise of the washing machine may berequired by the user. For example, if washing is performed at nightand/or an infant or child is asleep, it is preferable that the washingmachine operate with less operation noise. Reduced operational noise maybe achieved in various ways. Optimization of a washing control methodmay reduce the noise effectively, without increased production cost. Thewashing control method configured to reduce such noise may be embodiedby a single course, namely, a silent course presented by optimization ofoperation conditions. The silent course is based on the standard courseand is embodied by optimizing or omitting certain operational conditionsof certain cycles or steps of the standard course. FIG. 16 is a flowchart of different steps of the silent course from the steps of thestandard course. First, the user may select the silent course from thecourse selecting part 117 (S1610) and the control part may implement afollowing series of operations.

H.1 Washing Cycle (S1630):

H.1.1 Laundry Amount Determining (S1631):

The control part may start a laundry amount determining step todetermine the amount of laundry. The laundry amount determining step hasbeen described above and thus further detailed description thereof willbe omitted. An object of the silent course is to reduce noise and/orvibration while also maintaining washing ability. A drum driving motionof each step may be differentiated according to the laundry amount.

H.1.2. Water Supplying (S1633):

Once the user selects the silent course, a water supplying step maystart. The water supplying step supplies wash water to the tub. Also,the water supplying step dissolves detergent mixed with the wash waterand wets the laundry loaded into the drum. In the water supplying stepof the silent course, the control part may supply a larger amount ofwash water to the tub, compared with the water supplying step of thestandard course. The reason why more wash water is supplied will bedescribed in a following washing step.

H.1.2.1 First Water Supplying (S1635):

In the water supplying step, the control part may implement a firstwater supplying step, together with the supply of the wash water. In thefirst water supplying step, the control part controls the drum to bedriven in the rolling motion.

As mentioned above, the rolling motion rotates the drum in apredetermined direction continuously and the laundry is separated fromthe drum after being rotated to the position of 90° or less with respectto the rotation direction of the drum from the lowest point of the drum.In the rolling motion, the drum is rotated at a relatively low speed andthe separated laundry is rolling-moved on the inner surface of the drumto the lowest point of the drum, without dropping to the lowest point.Because of that, the rotation of the drum and the rolling movement ofthe laundry may generate a predetermined vortex in the wash water anddetergent dissolution may be promoted in the wash water. At the sametime, the rolling motion induces the rolling movement of the laundryalong the inner surface of the drum and it may have no noise of theshock generated by the sudden dropping of the laundry. As a result, therolling motion in the first water supplying step may allow the detergentto be sufficiently dissolved in the wash water while also reducingnoise. In the first water supplying step, the rolling motion may berepeated for a predetermined time period a number of times.

H.1.2.2 Second Water Supplying (S1637):

Once the first water supplying step is completed, the control part maystart a second water supplying step. In the second water supplying step,the control part may control the drum to be driven in the filtrationmotion and the rolling motion sequentially, with supplying the washwater to the tub continuously. The first and second water supplyingsteps may be distinguished from each other according to the respectivepreset time and the time of each step may be adjustable according to theamount of laundry.

As mentioned above, the filtration motion rotates the drum at a highspeed to generate a centrifugal force and the generated centrifugalforce maintains the laundry in close contact with the innercircumferential surface of the drum. Also, the wash water passes throughthe laundry and the through holes of the drum by the centrifugal forceto be discharged to the tub. As a result, the laundry is wet by the washwater in the filtration motion. In addition, the wash water passesthrough the laundry simply and the laundry may not be damaged whilebeing wet in the wash water. After the filtration motion is implementedfor a predetermined time period, the rolling motion may be implemented.As mentioned above, the rolling motion in the first water supplying stepmay allow the detergent to be sufficiently dissolved in the wash waterwhile also reducing noise. Also, a broader surface area of the laundrycontacts the wash water, rolling-moved along the inner surface of thedrum, and thus the laundry may be wet in the wash water more effectivelyand uniformly. As a result, the combination of the filtration androlling motions may minimize the noise and enable laundry wetting,detergent dissolution and laundry disentangling to be achievedeffectively. Such the sequential combination of the filtration androlling motions may be repeated several numbers of times for apredetermined time period.

H.1.3 Washing (S1635):

Once the wash water is supplied to a predetermined water level, thewater supplying step is completed and then a washing step may start.

H.1.3.1 Heating Step/First Washing (S1640):

Once the water supplying step is completed, the control part starts afirst washing step. The first washing step may include a heating stepconfigured to heat the wash water to a predetermined temperature.Different from the heating step and the washing step of the standardcourse, the first washing step of the silent course may include only therolling motion. The rolling motion enables the laundry to rolling-movealong the inner surface of the drum without suddenly dropping thelaundry. As a result, such a rolling movement may maximize the frictionbetween the laundry and the wash water and between the laundry and thedrum and the washing step may remove contaminants from the laundryeffectively, with minimized noise.

As mentioned above, the control part in the water supplying step maysupply a larger amount of wash water, compared with the water supplyingstep of the standard course. For example, the control part may controlthe amount of wash water supplied in the washing step of the silentcourse to be 1.2 times as much as the amount of the wash water suppliedto the same amount of laundry. The increase in the wash water amountresults in increasing of the water level inside the drum. When thelaundry is rolling-moved in the drum with the increased water level bythe rolling motion, the friction between the wash water and the laundrymay be further increased and the washing ability may be furtherimproved. Eventually, the rolling motion adapted in the washing step mayprovide adequate washing ability while also suppressing noisegeneration.

Once a predetermined amount or more of the laundry is loaded into thedrum, the slow speed rotation of the drum cannot rotate the laundrytogether with the drum easily. Even if rotated together with the drum,the large amount of laundry may have difficulty being rolling-moved onthe inner surface of the drum because of the volume. As a result, sincethe rolling motion rotates the drum at a relatively low speed, the largeamount of laundry fails to rolling-move as intended and thus fails toachieve the desired washing ability. Because of that, if washing a largeamount of laundry, the washing step may adapt a different drum motionfrom the rolling motion described above.

That is, when the laundry amount measured in the laundry amountdetermining step is larger than a preset reference value, the tumblingmotion may be implemented in the washing step, instead of the rollingmotion. The tumbling motion rotates the drum in the predetermineddirection continuously, similar to the rolling motion, and the rotationspeed of the drum in the tumbling motion is higher then that of the drumin the rolling motion. As a result, the laundry is separated from thedrum after being rotated to the position of 90° or more with respect tothe rotation direction of the drum from the lowest point of the drum.Since the drum is rotated at a relatively high speed in the tumblingmotion, the separated laundry is dropped to the lowest point of the drumand this is different from the rolling motion. As a result, the laundrymay be washed by the shock generated by the friction between the laundryand the wash water and the dropping. Although the tumbling motiongenerates more noise than the rolling motion, the generated noise may beless than the noise generated in the other drum motions such as the stepmotion and the scrub motion which have the strong washing ability.Because of that, tumbling motion may wash the large amount of thelaundry effectively, while suppressing noise generation as much aspossible. When the measured laundry amount is less than the referencevalue, the rolling motion may be implemented as mentioned above.

To promote the heating of the wash water, a heating preparing step maybe implemented before a heating step. However, the heating preparingstep may include a drum motion and the drum motion may generate noise.As a result, preliminary steps such as the heating preparing step beforethe first washing step may not be implemented in the washing step ofthis course and the wash water may be heated to a predeterminedtemperature in the first washing step. The wash water may be heated bythe heater or the steam generating device installed in the tub.

H.1.3.2 Second Washing (S1642):

The control part may start a second washing step after the first washingstep. Contaminants may be more completely removed in the second washingstep. Like the first washing step, the second washing step of the silentcourse may include only the rolling motion. The noise generation may beminimized in the rolling motion and the contaminants of the laundry maybe removed effectively in the rolling motion, as described above. Also,a larger amount of wash water is supplied in the rolling motion,compared with the amount of wash water supplied in the standard course.Because of that, the adaptation of the rolling motion may securesufficient washing ability while also suppressing noise generation.

If the laundry amount is large, the drum is driven in the tumblingmotion. If the laundry amount is small, the drum is driven in therolling motion, similar to the first washing step described above.

H.2 Rinsing Cycle (1650):

Once the washing cycle is completed, a rinsing cycle configured toremove detergent remnants and contaminants from the laundry may start.The rinsing cycle is similar to the rinsing cycles of the standardcourse described above and thus further detailed description thereofwill be omitted.

The first rinsing step implemented in the initial stage of the rinsingcycle of the standard course includes the first drum driving step usingthe filtration motion, which may generate much noise. As a result, thefiltration motion is not implemented in the rinsing cycle of the silentcourse. While the steps of the rinsing cycle of the standard course mayadapt various drum motions, the silent course may apply only the rollingmotion to the steps of the rinsing cycle to reduce noise as in thewashing step.

To reinforce the overall rinsing ability, the rinsing steps are repeateda more times in the silent course than in the standard course. Forexample, the rinsing cycle may be implemented four times or more. Thisis because the drum is rotated at a lower RPM in the spinning of thesilent course than in the spinning cycle of the standard course, thusdeteriorating rinsing ability. That is, in the spinning cycle, the washwater is typically separated from the laundry by the centrifugal forcegenerated by the high speed rotation of the drum and detergent andcontaminants are separated from the laundry together with the wash watersimultaneously. However, in the normal spinning step of the spinningcycle of the silent course, the drum is rotated at a lower RPM and thusthe final rinsing ability may be deteriorated. As a result, the rinsingsteps may be implemented four times or more in the rinsing cycle of thesilent course.

H.3 Spinning Cycle (S1670):

Once the rinsing cycle is completed, the control part may start aspinning cycle. The spinning cycle is similar to the spinning cycle ofthe standard course and thus further detailed description thereof willbe omitted.

In a normal spinning step of the silent course, the drum may be rotatedat a lower RPM than in the normal spinning step of the standard courseto reduce noise. For example, to reduce noise, the drum may be rotatedat a predetermined RPM which is 50% of the RPM of the normal spinningcycle of the standard course. That is, the drum may be rotated atapproximately 400 RPM.

I. Course I (Cotton, Synthetic, Mixture Courses)

Like the functional clothing course described above, courses may beprovided corresponding to the kinds of laundry items and to fabric typesof the laundry. For example, there may be provided a cotton courseconfigured to wash cotton fabric such as towels, tablecloths, T-shirtsand the like, a synthetic course or easy care course configured to washsynthetic fabric, and a mixture course configured to wash a mixture offabric types such as cotton and synthetic fabrics. Synthetic materialmay include, for example, polyamide, acrylic, polyester and other suchfabrics.

Cotton fabric and synthetic fabric have different characteristics. Thatis, cotton fabric is more resistant to friction and shock, with lessconcern of deformity, than the synthetic fabric. In addition, cottonfabric can absorb more wash water than the synthetic fabric and has lessconcern of wrinkles than the synthetic fabric. However, it is not easyto separate the cotton fabric laundry items from synthetic fabriclaundry items and to implement corresponding washing courses to washthem separately all the time. This is because the user usually wearsclothes fabricated from the cotton and synthetic fabric together, anddoes not want to wash separate partial loads of cotton and syntheticclothing. As a result, a washing course combining the merits of thecotton course and the synthetic course, that is, a mixture course, maybe provided.

The mixture course may be useful for many reasons. For example, if theuser separates the cotton fabric laundry items and synthetic fabriclaundry items to wash them separately, washing may be delayeddisadvantageously until a predetermined amount of laundry is collected,and thus contaminated laundry may be neglected for a relatively longtime. Of course, if a small amount of laundry is washed separately,energy may be wasted. Because of that, the mixture course capable ofwashing conventional kinds of fabric laundry items together may preventthe problem of laundry neglect and energy waste.

In the washing course provided corresponding to such mixtures of typesof fabric shown in FIG. 17, a washing cycle, a rinsing cycle and aspinning cycle may be differentiated according to the characteristics ofthe particular type of fabric. As follows, the cotton course, thesynthetic course and the mixture course having operational conditions ofeach step adjusted based on the type of fabric will be described inreference to the cycles and steps of the standard course describedabove. Compared with the standard course, repeated detailed descriptionwill be omitted as appropriate, and difference will be described indetail.

Once the user selects the cotton course, the synthetic course or themixture course (S1710) according to the type of fabric of the laundry,the control part may implement a wash cycle (S1730), a rinse cycle(S1750), and a spin cycle (S1770) and steps according to the selectedcourse.

I.1 Washing Cycle:

I.1.1 Laundry Amount Determining Step (S1734):

The control part may determine the amount of the laundry in a washingcycle and a method of laundry amount determining in this course issimilar to the above methods and repeated description will be omitted.The measured laundry amount may be used in a following step properly,which will be described in detail.

I.1.2. Water Supplying Step (S1733):

The control part may implement a water supplying step configured tosupply wash water and detergent to the tub or the drum and to dissolvethe detergent in the wash water. That is, the wash water is suppliedfrom an external water supply source, together with the detergent. Tosupply the wash water and the detergent to the laundry initially, thewash water and the detergent are supplied to the laundry inside the drumdirectly. That is, a water supply path of the wash water may be locatedin a front upper portion of the drum toward the drum inside, not in alower portion of the tub. When the detergent is a powder type, detergentdissolution fails to be sufficiently implemented and a drum drivingmotion of the water supplying step, which will be described later, maydissolve the detergent sufficiently. As a result, the wash water and thedetergent are supplied to the laundry in the initial stage of thewashing cycle and the time required by the washing cycle may be reducedto improve washing efficiency.

I.1.2.1 Detergent Dissolution Promoting (S1735):

In a detergent dissolution promoting step, a drum driving motion may bedifferentiated according to the type of laundry fabric. For example, thescrub motion may be implemented for cotton fabric laundry items and thestep motion may be implemented for synthetic fabric laundry items. Inalternative embodiments, the scrub motion and/or the step motion may beimplemented.

The scrub motion bends/stretches and scrubs the laundry by dropping thelaundry, to generate friction. Because of that, a human hands'scrubbing-like effect can be expected in the initial stage of thewashing cycle. However, this scrub motion may be implemented for fabricwhich is somewhat resistant to friction and the drum driving motion maybe the scrub motion in the detergent dissolution promoting step of thecotton course.

According to characteristics of the synthetic fabric, synthetic laundryitems are lighter than the cotton laundry items and the syntheticlaundry items have a lower percentage of the water than the cottonlaundry items. Also, the synthetic laundry items have more concern fordamage caused by friction than the cotton laundry items. Because ofthat, the step motion may be implemented in the detergent dissolutionpromoting step to promote the detergent dissolution and to preventfabric damage. That is, a drum driving motion in a detergent dissolutionpromoting step for the synthetic fabric may be the step motion. The stepmotion applies the maximum dropping shock to light synthetic fabric topromote the detergent dissolution and the effect of the humans'striking-like washing effect may be expected in the initial stage of thewashing cycle.

A drum driving motion of a detergent dissolution promoting step in themixture course may be combination of the step motion and the scrubmotion. That is, the step motion and the scrub motion which are optimalto the cotton fabric and the synthetic fabric, respectively, may becombined such that the detergent dissolution may be promoted and thewashing effect may be expected in the initial stage of the washingcycle. In this case, the different drum driving motions are combined andbecause of that, laundry movement patterns and wash water movementpatterns may be diverse enough to improve the efficiency of the washingcycle.

I.1.2.2 Laundry Wetting (S1736):

In the laundry wetting step of the standard course, the drum may berotated in the rolling motion. The rolling motion generates lessfriction applied to the laundry than the above scrub motion and therolling motion is implemented in a period having the laundry wettingimplemented. As a result, although friction is applied between the wetlaundry items, there will be little concern of laundry damage and thelaundry wetting step implemented in the rolling motion may beimplemented similarly, regardless of the fabric kinds of the laundry.

Regardless of whether the fabric is cotton or synthetic, the rollingmotion may be implemented in the laundry wetting step. Even when theuser selects any one of the cotton course, the mixture course or thesynthetic course, the rolling motion may be implemented in the laundrywetting step after the detergent dissolution promoting step.

The laundry wetting step may include two steps including first andsecond laundry wetting steps which are separately implemented. Forexample, when the laundry wetting step is implemented for 10 minutes,the first laundry wetting step may be implemented for 5 minutes and thesecond laundry wetting step may be implemented for 5 minutes.Specifically, additional water supply may be implemented in the firstlaundry wetting step and the second laundry wetting step may beimplemented once the additional water supply is completed.

Drum driving motions of the first and second laundry wetting steps maybe differentiated to wet the laundry more effectively and to supply boththe detergent and wash water to the laundry uniformly. For example, thedrum driving motion of the first laundry wetting step may be the rollingmotion and the drum driving motion of the second laundry wetting stepmay be a combination of the rolling motion and filtration motion. Thatis, the rolling motion may be implemented at a predetermined net actingratio in the first laundry wetting step. In the second laundry wettingstep, after the filtration motion is implemented one time, the rollingmotion is implemented four times and this composes a single cycle. Thecycle may be repeated.

The rolling motion continuously turns-over the laundry in the lowerportion of the drum to increase the contact time between the wash waterand the detergent. The filtration motion spreads the laundry broadly andallows the wash water and the detergent to be supplied to the laundryuniformly, such that effective laundry wetting may be possible. It maytypically take approximately 13 minutes to complete the laundry wettingin the tumbling motion, while laundry wetting may take approximately 10minutes according to this embodiment.

The drum driving motion of the first laundry wetting step may bedifferentiated according to the amount of laundry. The drum drivingmotion of the first laundry wetting step may be differentiated accordingto the laundry amount determined in the laundry amount determining step.For example, if the determined laundry amount is a predetermined levelor more, the drum is driven in the rolling motion as mentioned above. Ifthe determined laundry amount is less than the predetermined level, thedrum may be driven in a combination of the step and rolling motions.

The step motion suddenly drops the laundry after lifting. If the laundryamount is large, the distance of the laundry dropping may be reduced.Thus, the step motion is proper to a small amount of laundry. Such astep motion might cause damage to the laundry. As a result, in thecotton course, when the laundry amount is less than the predeterminedlevel, the combination of the step motion and rolling motion may beimplemented in the first laundry wetting step. When the laundry amountis the predetermined level or more, the rolling motion may beimplemented in the first laundry wetting step. In the synthetic courseand the mixture course having a concern of laundry damage, the rollingmotion may be implemented in the first laundry wetting step, regardlessof the laundry amount.

In alternative embodiments, a circulating step may be implemented in thewater supplying step, in relation to the drum driving. That is, thecirculating step may be synchronized with the driving of the motorconfigured to drive the drum. The wash water circulated when the laundryis moved by the driving of the drum may be supplied to the laundry andthe object of the water supplying step may be achieved more effectively.

The detergent dissolution promoting step and the laundry wetting stepare included in the water supplying step according to this embodiment.However, the detergent dissolution promoting step and the laundrywetting step could be provided independently from the water supplyingstep. In this case, after the water supply, the detergent dissolutionpromoting step or the laundry wetting step may be implemented.

I.1.3. Heating (S1741):

A heating step may be differentiated according to the selected operationcourse in this course. For example, the temperature of wash water usedin the heating step may be set different depending on the type of fabricof the laundry.

Cotton fabric is somewhat tolerant of heat. As the temperature of thewash water increases, the more the detergent is dissolved in the washwater and activation of the detergent is further promoted. As a result,when the cotton course is selected, the temperature of the wash watermay be set to be approximately 60° C. in the heating step. Such atemperature of the wash water may be selected from a within a rangeextending from cold water up to water at approximately 95° C. via theoption selecting part 118. As the temperature of the wash waterincreases, detergent activation may be further promoted and the washingability may further improved, further improving an effect ofsterilization/bleach if appropriate.

Synthetic fabric may be more subject to/less tolerant of heat and thusthe synthetic course or mixture course aims to prevent the heat fromdamaging the laundry. When the synthetic course or the mixture course isselected, the temperature of the wash water may be set to beapproximately 40° C. in the heating step. In the synthetic course or themixture course, the user may be prevented from selecting the temperatureof the wash water to be higher than 60° C. to prevent laundry damage.For example, when the synthetic course or the mixture course isselected, the temperature of the wash water in the heating step may havethe highest limit of 60° C.

A drum driving motion of the heating step may be the tumbling motion,regardless of the selected course. This is because the tumbling motioncan disentangle the laundry, while reducing laundry damage. As a result,the tumbling motion may allow steam or heated-wash water to besufficiently transmitted to the laundry.

In alternative embodiments, a circulating step may be implemented in theheating step. The circulating step may be synchronized with the drivingof the drum. Since the circulating step is implemented after initialheating is implemented to a predetermined degree, the circulating stepmay be synchronized with the drum driving in a predetermined time afterthe initial driving of the drum starts.

I.1.4 Washing (S1742):

A drum driving motion of a washing step may be a sequential combinationof the rolling motion and/or tumbling motion and/or swing motion. Thedrum driving motion of the washing step may be differentiated accordingto the selected course, because both the effect of fabric protection andthe effect of improved washing ability are to be achieved.

That is, in the case of washing cotton fabric laundry, a drum drivingmotion configured to wash the laundry using a strong mechanical forcemay be implemented. In the case of washing synthetic fabric laundry, adrum driving motion configured to wash the laundry by using a relativelylow mechanical force may be implemented. The washing step may includeone of the steps of the washing cycle, which requires the longest time.As a result, the washing step may be controlled to implement washingmost efficiently. Since the required time of the washing step is long,the most laundry damage is likely to be generated in the washing step.

Considering that, the drum may be driven in combination of the rollingmotion and tumbling motion in the washing step when the cotton course isselected. The combination of the two different motions applies variouspatterns of the strong mechanical force to the laundry and the washingefficiency may be improved. That is, according to the characteristics ofthe cotton fabric, there is little concern of fabric damage. Because ofthat, the strong mechanical force is applied to wash the laundry and thewashing effect may be improved more. When the cotton course is selected,a combination of the filtration motion and the tumbling motion may beimplemented in a washing step, with the circulating step synchronizedwith the driving of the drum. Since the cotton fabric has little concernof laundry damage, the filtration motion may supply the wash water andthe detergent to the laundry continuously and effectively.

In contrast, when the synthetic course is selected, the drum may berotated in a combination of the swing motion and the tumbling motion inthe washing step. The combination of the two different motions mayimprove the washing effect. The swing motion swings the laundry in thewash water gently and thus laundry damage generated by the friction maybe minimized. In addition, the time in which the laundry contacts withthe wash water may be increased enough to improve the washing effect.

As the mixture course is provided to wash both cotton laundry items andsynthetic laundry items together effectively, the washing effect is tobe improved and the laundry damage is to be reduced as much as possible,regardless of the laundry fabric type. To satisfy that, the drum drivingmotion of the washing step when the mixture course is selected may be acombination of the tumbling motion and/or swing motion and/or rollingmotion. That is, the swing motion configured to prevent the fabricdamage may be provided and the rolling motion configured to improve thewashing ability may be provided.

In the synthetic course and the mixture course, a circulating step maybe synchronized with the drum driving to allow both of wash water anddetergent to be supplied to the laundry continuously.

As mentioned above, although one of the cotton course, synthetic courseor the mixture course is selected, the drum driving motions of thewashing step may be controlled for a combination of different twomotions. This is to generate diverse patterns of the mechanical forceand the movement of the laundry and to improve the user's satisfactionvisually.

When a contaminant level of the laundry is selected from the optionselecting part 118, the net acting ratio of the motor may be adjustedaccording to the selected contaminant level. However, increasing the netacting ratio also increases the time in which the mechanical force isapplied to the laundry. Considering that, the net acting ratio of thewashing cycle may be differentiated according to the course selected bythe user. That is, the net acting ratio of the cotton course may belarger than that of the synthetic course and mixture course.

I.2 Rinsing Cycle (S1750):

Once the washing cycle is completed, a rinsing cycle may start. In therinsing cycle, rinsing steps configured to drain the wash water afterthe laundry is rinsed using supplied wash water may be repeated. Therinsing step of the rinsing cycle in this course may be repeated threetimes or more.

The wash water may be supplied for a water level of the rinsing cycle tobe higher than a water level of the washing cycle. That is, the washwater may be supplied to a predetermined water level that is visiblefrom the outside to improve the rinsing effect by using sufficient washwater.

A drum driving motion of the rinsing cycle may be the tumbling motion.The tumbling motion submerges/removes the laundry into/from the washwater and this may be repeated. The high water level together with thetumbling motion visually notifies the user of sufficient rinsing. Thetumbling motion of the rinsing cycle may prevent overheat of the motoras well improve rinsing efficiency. That is, the water level of therinsing cycle may be higher than that of the washing cycle and the loadapplied to the drum may be increased by the wash water accordingly. Thestep motion, scrub motion and the swing motion repeat the rotation andbrake of the motor. As a result, such a brake may generate excessiveload on the motor. Also, if the water level is high, the load generatedby the wash water may be increased. In the rinsing cycle having a highwater level, the drum driving motion does not have nay sudden brake toprevent the overheat of the motor. Thus, the tumbling motion configuredto rotate the drum in the predetermined direction may be preferable inthe rinsing cycle.

A circulating step may be implemented in the rinsing cycle to circulatethe wash water held in the tub into the drum. This may generate aneffect of visual notification to the user of sufficient rinsing.

I.3. Spinning Cycle (S1770):

Once the washing cycle and the rinsing cycle are completed, a spinningcycle configured to discharge the wash water from the laundry as much aspossible may be implemented. In a normal spinning step of the spinningcycle, the drum RPM may be differentiated according to the courseselected by the user, considering the percentage of water content andresidual wrinkling according to the type of fabric.

Cotton fabric has a high percentage of water content or absorption, withless concern of wrinkles. Even if there are wrinkles generated in thecotton fabric, it is easy to remove the wrinkles. In contrast, thesynthetic fabric has a low percentage of water content or absorption,with large concern of wrinkles. As a result, in the cotton course, apreset RPM may be higher than in the synthetic course and mixturecourse, and the preset RPM may be, for example, 1000 RPM or more. Here,the spinning RPM may be changeable via the option selecting part by theuser.

The preset RPM of the synthetic course and the mixture course may be setto be 400 to 600 RPM. Even when spinning synthetic laundry items at alow RPM, the wash water may be discharged from the synthetic laundryitems enough and wrinkles may be prevented. In this case, the spinningRPM may be changeable via the option selecting part by the user. Incertain embodiments, the spinning RPM is set to a maximum of 800 RPM.

J. Course J (Wool Course):

A washing course provided according to a type of fabric of the laundrymay also include a wool course, rather than the cotton course, syntheticcourse and mixture course. The wool course is applied to laundry havingless contaminants and a large concern for fabric damage. That is, thewool course may be provided to wash wool fabric laundry items which arehand washable. If washed using the strong mechanical force, the woolfabric laundry items are likely to be damaged. As a result, in the woolcourse, the drum is driven in a predetermined motion having a weakmechanical force, for example, the swing motion. Consideringcharacteristics of the wool fabric, drum driving motions of a washingcycle, a rinsing cycle and spinning cycle of the wool course may bedifferent from the drum motion of the standard course.

J.1. Washing cycle:

In the wool course, it is important to prevent fabric damage and thedrum may be driven in the swing motion configured to move the laundryrightward and leftward in a lower portion of the drum gently, in awashing cycle of the wool course. In this case, a water level may behigh enough to allow a water level of the drum inside to be visible fromoutside. Because of that, the friction between the inner circumferentialsurface of the drum and the laundry may be minimized and the liftstouching of the laundry may be repeated, rotating the laundry submergedin the wash water, and this prevents damage to the laundry and it allowswashing or rinsing to be implemented softly. This swing motion mayminimize damage to the laundry and increase the time of contact with thewash water and the detergent with the laundry to improve the washingeffect.

The wool course is shown in FIG. 18. A washing cycle of the wool courseis selected (S1810). In an initial stage of the washing cycle (S1830),wash water and detergent may be supplied to the tub or the drum, thatis, a water supplying step (S1833) may be implemented. The watersupplying step may include a detergent dissolution promoting step(S1835) and a laundry wetting step (S1836). The detergent dissolutionpromoting step is configured to promote detergent dissolutionimplemented in an initial stage of the water supplying step and thelaundry wetting step is configured to wet the laundry enough to preparea washing step after the water supplying is completed. The laundrywetting step may be implemented after or before the water supplying iscompleted.

The detergent used in the wool course may be neutral detergent andtypically a liquid type which may not require as much time to bedissolved in the wash water as a powder type. Considering that, thedetergent is supplied to the laundry in the initial stage of the watersupplying, together with the wash water. Once the water supply starts,wash water is supplied to the liquid detergent held in a detergent box.The wash water and the liquid detergent are supplied together to the tubor the drum. To supply the wash water and the liquid detergent to thelaundry more quickly, the wash water and the liquid detergent mixed witheach other may be sprayed onto the laundry located in the drum. For moreeffective detergent dissolution, a circulating step configured to supplythe wash water held in the tub to the upper portion of the drum may beimplemented.

The drum may be driven in the swing motion and then a gentle vortex isgenerated in the wash water such that the detergent dissolution may bepromoted, while simultaneously preventing laundry damage. Once the watersupply is completed, the swing motion and the circulating step may beimplemented together to prepare for the washing step. This may beconsidered a type of laundry wetting step.

Once the detergent dissolution promoting step and the laundry wettingstep are completed, a heating step (S1841) configured to heat the washwater may be implemented if necessary. However, the temperature of thewash water in the heating step my be controlled not to exceed 40° C.Heat generated if the temperature of the wash water is heightened toomuch will deform the laundry and damage wool fabric laundry. Thetemperature of 40° C. generates no thermal deformity and promotesactivation of the detergent and wash water absorption into the laundry.

A drum driving motion of the washing step (S1842) may be the swingmotion. The washing step requires the longest time out of the steps ofthe washing cycle and, in order to prevent laundry damage in the washingstep, the swing motion is used in the washing step. If mechanical forceapplication and stopping are applied to the wool fabric laundryrepeatedly, fabric damage may be generated. Such mechanical repetitiongenerates contraction of wool fabric. To prevent the contraction, theswing motion may be implemented in the washing step continuously.

As mentioned above, the swing motion drives the drum by using therheostatic braking and it may not apply much load to the motor. Inaddition, the swing motion may have drum driving configured toreciprocate between right and left less than 90° C. As a result, a largeload is not required to lift the laundry. If the drum were to be drivenin the scrub motion and the step motion continuously, excessive load maybe applied to the motor. In the tumbling motion, a smaller load may beapplied to the motor than in the scrub motion and the step motion, butthe laundry is lifted and dropped to generate fabric damage. Consideringthis, the swing motion is implemented in the washing step.

J.2 Rinsing Cycle (S1850):

Once the washing cycle is completed, a rinsing cycle may be implemented.First, a medium spinning may be implemented. After the medium spinning,wash water is supplied to start rinsing and the rinsing cycle isimplemented several times if necessary. That is, after the watersupplying and rinsing, water draining may be repeated. Typically, mediumspinning is implemented in the middle of the water supplying after waterdraining.

The medium spinning disentangles the laundry at a relatively lowrotation speed. Medium spinning includes an intermediate-spinningconfigured to disentangle the laundry at a relatively low rotationspeed, while sensing vibration, and a main-spinning configured to spinthe laundry at a relatively high rotation speed for a predeterminedtime. The intermediate-spinning may be implemented at approximately 100RPM and the main-spinning may be implemented at approximately 200 RPM(low resonance frequency) or more.

However, when the wool course is selected, the medium spinning may beomitted. The medium spinning is a process of discharging the wash waterfrom the laundry by centrifugal force and a tensile force may begenerated in the laundry inevitably. Because of that, wool fabriclaundry which is subject to external force may be subject to damage inthe spinning cycle. To relieve such a concern, the medium spinning maybe omitted. For example, the main-spinning of the medium spinning isomitted and only the intermediate-spinning may be implemented. If all ofthe process of discharging the wash water by the centrifugal force isomitted, the rinsing ability may be deteriorated remarkably. Consideringthe rinsing ability and the laundry damage, only theintermediate-spinning may be implemented and the main-spinning may beomitted.

The series of the rinsing step including the water supplying anddraining may be implemented three times or more, because detergentremnants have to be sufficiently discharged from the laundry. The waterlevel of the rinsing may be higher than the water level of the washingstep and a circulating step may be implemented in the rinsing. When theliquid detergent is used, it is generally possible to discharge thedetergent remnants sufficiently because of rinsing step is implementedtwo times and the medium spinning. However, in case of this course, themain-spinning of the medium spinning is omitted to prevent the laundrydamage and the rinsing step may be implemented three times to achievethe desired rinsing effect.

A drum driving of the rinsing step may be the swing motion to preventlaundry damage. The swing motion gently swings the laundry in the washwater and allows detergent remnants absorbed in the laundry to bedischarged into the wash water, such that rinsing efficiency may beenhanced.

J.3 Spinning Cycle (S1870):

Once the rinsing cycle is completed, a spinning cycle may start. Thespinning cycle is similar to the spinning cycle of the standard coursedescribed above. the drum RPM of the normal spinning step may be set tobe 800 RPM or less to protect the wool fabric of the laundry.

K. Course K (Delicate Course):

A washing course provided according to the type of fabric of the laundrymay include a delicate course as shown in FIG. 19 to wash laundry itemsmade of delicate fabric such as silk, plastic fabric, laundry itemshaving metal accessories attached thereto and other such delicatearticles. A drum motion having a relatively weak mechanical force, forexample, the swing motion, may be implemented to wash the delicatelaundry gently in the delicate course, similar to in the wool course. Asa result, taking characteristics of the delicate fabric intoconsideration, drum driving motions of a washing cycle, a rinsing cycle,and a spinning cycle of the delicate course may be different from thedrum driving motions of the standard course.

K.1 Washing Cycle (S1930):

Similar to the wool course, the delicate course is selected (S1910) andthe drum is driven in the swing motion in a washing cycle (S1930) of thedelicate course and wash water is supplied (S1933) to a relatively highwater level. Also, a detergent dissolution promoting step (S1935) may besimilar to the detergent dissolution promoting step of the wool course,because liquid type detergent is generally used to wash the delicatefabric laundry items in the delicate course, like in the wool course.However, after the detergent dissolution promoting step, a laundrywetting step (S1936) may be different from the laundry wetting step ofthe wool course. The wool fabric has relatively good water absorptionability in comparison to the delicate fabric, and the delicate fabric ismore subject to heat damage in comparison to the wool fabric. Because ofthat, the temperature of the wash water used to wash the delicate fabricmay be set to be approximately 30° C. Although cold water could beselected, a temperature higher than 40° C. is generally not selected.

The laundry wetting may be implemented effectively using the filtrationmotion in the laundry wetting step. A circulating step may also beimplemented. After spin-driving the drum and distributing the laundryuniformly inside the drum to broaden the surface area of the laundry,the circulating step circulates the wash water held in the tub towardthe laundry. In addition, the swing motion is implemented to submergethe laundry in the wash water and to generate gentle movement of thelaundry to promote laundry wetting. The filtration motion and the swingmotion are repeated in various patterns to promote laundry wetting.However, the drum driving motion of the laundry wetting step may be onlythe swing motion.

Once the laundry wetting is completed, a washing step may start (S1942).A drum motion of the washing step may be the swing motion. The delicatefabric may be more resistant to the external shock, compared with thewool fabric. To achieve more effective washing efficiency, the drummotion of the washing step may be a combination of the swing motion andthe tumbling motion, with a relatively high wash water level.

Alternatively, only the tumbling motion may be implemented in thewashing step. In this case, the dropping laundry is collided against thesurface of the wash water, not the inner bottom surface of the drumbecause of the high water level. That means the dropping distance isreduced. While the shock applied to the laundry is reduced by the highwater level, a vortex is generated in the wash water to improve thewashing effect. Since such the laundry has relatively low contamination,the time of the washing step may be set to be relatively short and thenet acting ratio may be set to be relatively low. Although only thetumbling motion is implemented, it is possible to prevent laundrydamage. A circulating step may also be implemented in the washing step.

K.2 Rinsing Cycle (S1950):

Once the washing cycle is completed, a rinsing cycle may start. Asmentioned above, the liquid type detergent may be used in the delicatecourse and detergent remnants may be sufficiently discharged by therinsing step implemented two times. Like the wool course, a mediumspinning may be omitted in the delicate course. For example, anintermediate-spinning is not omitted and only a main-spinning may beomitted. A drum motion of the rinsing cycle may be only the tumblingmotion. Such the tumbling motion has the effect of laundry distribution.That is, the tumbling motion allows the surface area of the laundry tocontact the wash water uniformly and discharge detergent remnantsoutside. In this case, a wash water level may be relatively high. Theswing motion may be added to the tumbling motion in the rinsing cycle.

K.3 Spinning Cycle (S1970):

Once the rinsing cycle is completed, a spinning cycle may start. Thespinning cycle of this course may be similar to that of the wool course.The drum RPM of a normal spinning step may be set not to exceed 800 RPM.The delicate fabric has a low percentage of water content/absorption andwash water may be discharged sufficiently even when the drum is rotatedat a relatively low RPM in the normal spinning step. Also, the normalspinning may be implemented at a relatively low RPM to prevent fabricdamage generated by spinning.

L. Course L (Sportswear Course):

A sportswear course shown in FIG. 2D may be provided in the washingcourse categorized based on the type of fabric of the laundry will nowbe described. The sportswear course may be provided to wash laundryitems made of functional fabric having good air permeability and goodperspiration absorbing function such as mountain-climbing clothes,jogging suits and sportswear. Like the wool course or delicate course, adrum motion having a weak mechanical force, for example, the swingmotion, may be implemented in the sportswear course. Because of that,considering characteristics of sportswear fabric, drum motions ofwashing, rinsing and spinning cycles provided in the sportswear coursemay be different from the drum motions of the standard course. Once thesportswear course is selected (S2010), the washing cycle (S2030),rinsing cycle (S2050) and the spinning cycle (S2070) may be implementedlike the wool course and the delicate course. However, because of thecharacteristics of the sportswear, the washing cycle of the sportswearcourse may be different from the washing cycle of the other coursesdescribed above.

L.1 Washing Cycle (S2030):

Sportswear has hydrophobic characteristics which prevent moisture frompermeating into fabric easily. As a result, compared with other kinds offabrics, the sportswear fabric has a low percentage of watercontent/absorption and thus water may be supplied to the sportswearfabric sufficiently and continuously in the washing cycle. For that, adrum driving motion of the washing cycle (S2030), especially, a watersupplying step (S2033) provided in the washing cycle, may be differentfrom the drum motion of the washing cycle in the other courses.

First, in this course, a drum driving motion of a detergent dissolutionpromoting step (S2035) may be the scrub motion and/or the step motion.The sportswear fabric has little concern of fabric damage, compared withthe wool or delicate fabric, so the sportswear course may use the drumdriving motion capable of applying a stronger mechanical force than theswing motion.

A laundry wetting step (S2036) of the sportswear course may be differentfrom the wool course and the delicate course. Although it can preventlaundry damage, the swing motion fails to supply enough wash water to afolded portion of the laundry due to the hydrophobic characteristics ofthe sportswear fabric. Considering this, the filtration motion(including a circulating step) may be implemented in the laundry wettingstep of the sportswear course. The filtration motion distributes thelaundry inside the drum uniformly and supplies the wash water to thelaundry uniformly. Together with the filtration motion, the rollingmotion configured to turn over the laundry continuously may beimplemented.

L.2 Rinsing Cycle (S2050):

A rinsing cycle of this course may similar to the rinsing cycles of thestandard course, the wool course and the delicate course, and thusfurther detailed description thereof will be omitted.

L.3 Spinning Cycle (S2070):

A spinning cycle of this course may similar to the spinning cycles ofthe standard course, the wool course and the delicate course, and thusfurther detailed description thereof will be omitted.

M. Course M:

In the washing machine according to the second embodiment describedabove with respect to FIG. 2, the tub is directly fixed to the cabinetand the drum is provided in the tub. According to the second embodiment,the tub is fixed and only the drum vibrates. As a result, it isimportant to prevent the drum from contacting the tub when the drum isrotated and the distance between the tub and the drum may be larger thanthe distance in the washing machine according to the first embodimentshown in FIG. 1.

When the distance between the tub and the drum is large, the laundryloaded in the drum may not be wet sufficiently by the wash watersupplied to the inside of the tub. Because of that, when the water issupplied in the washing machine according to the second embodiment, acirculating pump is put into operation to wet the laundry efficientlyand the wash water supplied to the tub may be circulated. For example,the circulating pump may be continuously driven or driven at apredetermined interval, with the water supply valve being open.

In the washing machine according to the second embodiment, the drum isconnected with the tub back 230. However, the tub back 230 is supportedby the suspension unit via the bearing housing 400, not by the tub.Because of that, compared with the washing machine according to thefirst embodiment which includes the tub back directly connected to thetub to support the load of the drum, the degree of freedom of the drumprovided in the washing machine according to the first embodiment may berelatively large and the front portion of the drum may have an increaseddegree of freedom.

However, when the water is supplied to the tub, a water supply line anda circulation line are used to supply the wash water from the frontportion of the tub. As a result, the laundry located in the frontportion of the drum would be wet first and the load on the front portionof the drum is larger than the load on the rear portion. This may causethe front portion of the drum to move downward. If the front portion ofthe drum moves downward, noise and vibration may be increased duringrotation of the drum and may cause the drum to contact the inner surfaceof the tub. As a result, in the washing machine according to the secondembodiment, the laundry located in the front portion and the rearportion of the drum should be wet uniformly when water is supplied tothe laundry. Course M is referred to as a washing course applicable tothe washing machine according to the second embodiment, namely, astandard course of the washing machine according to the secondembodiment. This course will be described in reference to FIG. 21.

M.1 Washing Cycle (S2130):

FIG. 21 is a flowchart of Course M. Once the user selects this coursefrom the course selecting part (S2110), the control part may implementthe following series of processes.

The washing cycle may include a laundry amount determining step (S2131),a water supplying step (S2133), a laundry wetting step (S2135), aheating step (S2137) and a washing step (S2139). In the followingdescription, the laundry wetting step is described as an independentstep separated from the water supplying step. However, the laundrywetting step may be included in the water supplying step.

M.1.1 Water Supplying (S2133):

After sensing the amount of laundry in the washing cycle, a watersupplying step may start. A laundry determining step of the watersupplying step is described in detail in the above courses and thusfurther detailed description thereof will be omitted.

The control part supplies wash water to the inside of the tub in thewater supplying step. Specifically, the control part opens the watersupplying valve to supply wash water to the tub via the water supplyline and the detergent box. As follows, when the wash water is suppliedto the laundry in the washing machine according to the secondembodiment, embodiments of water supplying methods capable of wettingthe laundry located in the front portion and the rear portion of thedrum uniformly will be described.

According to a water supplying method according to a first embodiment,when the water supplying step supplies water, the circulating pump isput into operation to circulate the wash water and the drum is put intooperation simultaneously. The control part may drive the drum in thescrub motion of the drum motions described above.

In the washing machine according to the second embodiment, the distancebetween the drum and the tub is larger than the distance between the tuband the drum in the first embodiment. Thus, in the second embodiment, ifthe drum is driven in the tumbling motion (as in the first embodiment)during the water supplying step, the laundry located in the rear portionof the drum fails to be wet uniformly. That is, since the gap betweenthe drum and the tub is larger, the wash water between the drum and thetub fails to be lifted by the rotation of the drum in the tumblingmotion and especially, the laundry located in the rear portion of thedrum fails to be wet.

As a result, in the water supplying step of this course, the scrubmotion is implemented instead of the tumbling motion. As mentionedabove, the scrub motion rotates the drum at a higher RPM (compared withthe tumbling motion), and the wash water located between the drum andthe tub may be lifted by the rotation of the drum and then dropped ontothe laundry.

In particular, if the rear portion of the drum and the tub are tilteddownward in the washing machine according to the second embodiment, thewash water located at the rear portion of the tub may be supplied to thesurface area of the laundry by the scrub motion. The scrub motionrotates the drum in the clockwise/counter-clockwise direction, reversingthe rotation direction suddenly. As a result, the suddenreversed-rotation of the drum generates a vortex in the wash water andthe laundry located in the front and rear portions of the drum may bewet uniformly.

When the water supply valve is open to supply the wash water, the drumis driven and rotated and the laundry is moved inside the drum accordingto the driving of the drum. In this case, the wash water supplied viathe water supply line connected to the front portion of the drum may bemostly supplied to the laundry moved in the front potion of the drum.The laundry located in the front portion of the drum is wet earlier,compared with the laundry located in the rear portion of the drum. As aresult, according to the second embodiment of the water supply method,the drum may not be driven until a predetermined time passes after thewater supply valve is open for the water supply, or until the waterlevel reaches a predetermined level. When the drum is not driven for thepredetermined time or until the wash water reaches the predeterminedlevel, the wash water supplied via the water supply line may be held inthe lower portion of the tub. The predetermined water level may bedetermined in consideration of the gap between the tub and the drum andthe predetermined time may be determined according to the capacity ofthe tub and the drum and the amount of the laundry.

In particular, if the rear portion of the tub provided in the washingmachine according to the second embodiment is tilted downward, much washwater may be collected in the rear portion of the tub. Hence, after apredetermined time passes, the drum is driven and rotated and the washwater held in the rear portion of the tub may wet the laundry located inthe rear portion of the drum uniformly. When the drum is driven in thewashing machine according to the second embodiment, a drum motion may bethe tumbling motion or the scrub motion.

When the water supply valve is open for the water supply according tothe second embodiment, without driving the drum, on/off of the watersupply valve may be controlled. That is, when the water supply valve isopen to supply the water, the wash water may have a predeterminedpressure because of the pressure of an external water supply source suchas a tap and then the wash water supplied along the water supply linemay be supplied to the front portion of the drum by the water pressure,such that the laundry located in the front portion of the drum may bewet earlier.

As a result, during the water supply in the second embodiment, the watersupply valve is repeatedly controlled to be on and off, not opencontinuously, and then the supplied wash water may be controlled to beon and off to have a predetermined water pressure enough not to besupplied to the drum directly. The pressure enough not to be supplied tothe drum directly means a water pressure which enables the watersupplied via the water supply line to fall along the drum, tub or doorto be collected in the lower portion of the tub, not sprayed into thedrum directly. The water falling along the drum, tub or door may becollected in the rear portion of the tub and description of the washwater collected in the tub is similar to the second embodiment, suchthat repeated description may be omitted.

When the laundry inside the drum is entangled during the water supplyingstep, the laundry may be wet partially. In particular, the laundrylocated in a center of a lump of the entangled laundry may not be wetand only the laundry located in a surface area of the lump may be wet.If only some of the laundry is wet, washing cannot be implemented in thewashing cycle and a washing ability may be deteriorated. As a result,the control part may drive the drum in the filtration motion to wet thelaundry uniformly if the laundry is entangled.

That is, the control part opens the water supply valve for the watersupply and it drives the circulating pump to circulate the wash watersimultaneously. Also, the control part rotates the drum at apredetermined RPM. The predetermined RPM is determined to be a RPMenabling the laundry not to be dropped by the gravity but to be in closecontact with the inner surface of the drum during the rotation of thedrum. As a result, the predetermined RPM may be set for the centrifugalforce generated by the rotation of the drum to be larger than thegravity acceleration when the drum is rotated. In addition, thepredetermined RPM may be set to be lower than an over speed area(approximately 200 RPM to 35 RPM) which generates resonance in thewashing machine. If the drum is rotated at a higher RPM than the overspeed area, the noise and vibration may be increased remarkably by theresonance. As a result, the predetermined RPM may be set to beapproximately 100 RPM to 170 RPM in this control method.

As a result, once the control part rotates the drum at the predeterminedRPM, the laundry may be in close contact with the inner surface of thedrum due to the centrifugal force. The wash water supplied via thecirculation line and the water supply line may be distributed along therotation of the drum. The distributed wash water may be supplied to thedrum and to the laundry in close contact with the inner surface of thedrum, such that the laundry may be uniformly wet.

M.1.2 Laundry Wetting (S2135):

After the water supplying step, the control part may start a laundrywetting step. In the laundry wetting step, the control part turns offthe water supply valve. The control part drives the drum and the washwater is circulated, while driving the circulation pump. Although thelaundry wetting is implemented in the water supplying step, the watersupply valve is off in the laundry wetting step and the laundry wettingmay be implemented by the driving of the drum.

In the laundry wetting step of this course, the control part drives thedrum to implement the laundry wetting. In this case, the control partmay drive the drum in the rolling motion. Since the rolling motionrolling-moves the laundry inside the drum along with the rotation of thedrum, the wash water contacts the laundry frequently and the laundrywetting may be implemented smoothly.

When implementing the laundry wetting step, the control part classifiesthe laundry wetting step into first and second laundry wetting steps.The first and second laundry wetting steps may be driven according todrum motions of the drum/that is, the control part may control the drummotions of the first and second laundry wetting step to be differentfrom each other. Operating the circulating pump is as follows.

Specifically, in the first laundry wetting step, the control part maydrive the drum in one of the rolling and/or step motions. The selectionof the drum driving motions may be determined according to the laundryamount. That is, if the amount of the laundry inside the drum is lessthan a predetermined reference value, for example, if the laundry amountis small, the control part may drive the drum according to the stepmotion. If the laundry amount is the reference value or more, thecontrol part may drive the drum according to the rolling motion.

As mentioned above, if the laundry amount is small, the laundry droppingeffect of the step motion may be improved. As a result, if the laundryamount is small in the first laundry wetting step, the step motion dropsthe laundry with the maximum dropping distance to allow the waterabsorbed in the laundry. In the meanwhile, if the laundry amount islarge in the first laundry wetting step, the rolling motion isimplemented. This is because the laundry dropping distance of the stepmotion is not relatively large in case of the large amount of thelaundry.

Hence, in the second laundry wetting step, the control part may drivethe drum at a predetermined RPM enabling the laundry to be in closecontact with the inner surface of the drum, not dropped by the gravity,that is, according to the filtration motion. Eventually, the drum isrotated at the predetermined RPM and the laundry may be in close contactwith the inner surface of the drum due to the centrifugal force. Thewash water supplied by the circulating pump is supplied to the laundryattached to the inner surface of the drum uniformly and thus the laundrymay be wet uniformly.

In the second laundry wetting step, the control part may implementanother drum driving motion after the filtration motion. For example,the control part may implement the rolling motion after the filtrationmotion. In this case, the filtration motion distributes the laundry tosupply the wash water to the laundry and the rolling motionrolling-moves the laundry to wet the laundry in the wash wateruniformly.

M.1.3 Heating (S2137):

After that, the control part starts a heating step. Specifically, thecontrol part drives the drum according to one of the tumbling and/orrolling and/or swing motions in the heating step, with driving theheater provided in the tub to heat the wash water held in the tub.

In the washing machine of the second embodiment, the gap between thedrum and the tub is larger than the gap of the first embodiment. Becauseof that, when the wash water is heated by driving the heater, the drumis rotated and only the wash water held in the tub is heated, not thewash water held in the drum. As a result, compared with the heated washwater, contaminants of the laundry may not be removed smoothly in awashing step, which will be described later, because of the relativelylow temperature of the laundry.

Because of that, the control method applied to the washing machineaccording to the second embodiment drives the circulating pump in theheating step, to circulate the wash water. The heated-wash water held inthe tub is re-supplied to the top portion of the tub by the circulatingpump such that the laundry may be heated. However, in the heating step,the circulating pump may be intermittently driven at a predeterminedinterval, not continuously driven. In particular, in the heating step,the circulating pump may be controlled so that the off-time of thecirculating pump is longer than the on-time. If the circulating pump isdriven continuously in the heating step or if the on-time of thecirculating pump is longer than the off-time, the wash water not heatedto the predetermined temperature would be circulated and the wash watermay not be heated to the desired temperature.

If the heater is provided in the tub, it is important to drive theheater when not exposed out of the water surface. If the heater isdriven while exposed, too much load is applied on the motor and theheater may malfunction. As a result, if the heater is driven in theheating step, a predetermined water level distant from the heater(hereafter, reference water level) may be maintained in the heatingstep. That is, when the water level is less than a reference level inthe heating step, the control part turns off the heater. When the waterlevel increases to the predetermined level or more by there-water-supply, the control part turns on the heater again(hereinafter, ‘cut off’).

However, if the heating step uses the cut-off method in the washingmachine according to the second embodiment, too much load may be appliedto the heater and a variety of circuits and washing machine usage lifemay be reduced.

That is, the heating step of the washing machine according to the secondembodiment drives and heats the heater, while driving circulating pumpsimultaneously as mentioned above. As a result, the water level insidethe tub may not be maintained regularly by the driving of thecirculation pump but may vary to a predetermined degree continuously. Inthis case, the water level inside the tub is varied enough to be loweredbelow the reference water level. Especially, if the water level insidethe tub is varied beyond the reference level, the heater may be turnedon if the water level is beyond the reference level and turned off ifthe water level is below the reference value, such that on/off of themotor may be repeated continuously. The repeated on/off of the heatermay apply too much load to the heater and the variety of the circuitsand it may reduce usage life.

As a result, if the water level inside the tub is decreased to reach thereference level during the driving of the motor in the heating step ofthe washing machine according to the second embodiment, water re-supplymay be implemented to prevent repeated on/off of the heater.Specifically, when the water level inside the tub is decreased below thereference level in the heating step, the control part stops the drivingof the drum and turns off the circulating pump. At this time,additionally, the water supply valve is open to implement waterre-supply. The reason why the drum and the circulating pump are turnedoff is that it is difficult to sense an accurate water level due to thevarying water level when the drum and the circulating pump are driven.By extension, it is possible to turn off the motor. In the meanwhile,the water re-supply may be implemented for a predetermined time or untilthe water supply is implemented for the water level to reach thereference level or beyond the reference level by the water levelsensing. A specific water level of the water re-supply may bedifferentiated according to the kind of course selected in the initialstage of heating.

M.1.4 Washing (S2139):

After the heating step, the control part may implement a washing stepconfigured to drive the circulating pump, while driving the drum. In thewashing step, a drum driving motion of the drum may be properly selectedout of the drum motions according to the course selected by the user.For example, a drum driving motion of the washing step may bedetermined, similar to one of the washing steps provided in the abovecourses. The circulating pump may be driven at a predetermined intervalto circulate the wash water held in the tub.

M.2 Rinsing Cycle (S2150):

Once the washing cycle is completed after the above steps, the controlpart may start a rinsing cycle. The general rinsing cycle may include arinsing-spinning step, a water supplying step, a drum driving step and awater draining step. First, the control part starts therinsing-spinning, rotating the drum at a second rotation speed (RPM 2)(S2151), in the rinsing—spinning step, to remove moisture and detergentremnants remaining in the laundry, while rotating the drum atapproximately 500 RPM to 700 RPM. The control part stops the drum andopens the water supply valve, to supply rinsing-water to the tub. Therinsing water level may be preset according to the course selected bythe user or according to the user's manual setting.

After the water supply, the control part drives the drum at a firstrotation speed (RPM 1) at a predetermined interval. In the drum drivingstep, the control part controls a drum driving motion of the drum andremoves detergent from the laundry. The control part of this step maycontrol the drum to be one of the tumbling and/or step and/or scruband/or rolling and/or swing motions described above.

Hence, the control part stops the driving of the drum and drives thewater drainage pump to drain the rinsing water held in the tub to theoutside (S2153).

The rinsing-spinning cycle, water supplying step, water supplying step,drum driving step and draining step described above may compose a singlecycle of the rinsing cycle. The control part may implement the cycle onetime or several times according to the selected course or the user'sselection. However, the single cycle of the rinsing cycle may includethe rinsing-spinning step. The second rotation speed of therinsing-spinning step may correspond to approximately 500 RPM to 700RPM, as mentioned above, and the rotation speed of such therinsing-spinning may correspond to the over speed area (approximately200 RPM to 350 RPM) which generates resonance of the washing machine.

As a result, if the laundry located in the drum is not distributeduniformly, a laundry distributing step configured to distribute thelaundry may be implemented and after that, the drum speed may beaccelerated for the rinsing-spinning. The laundry distributing steprepeatedly rotates the drum at the predetermined RPM in the clockwiseand/or counter-clockwise direction. After the laundry distributing step,an eccentricity level of the drum is identified. f the eccentricitylevel of the drum is less than a predetermined value, therinsing-spinning may be implemented. If the eccentricity level is thepredetermined value or more, the laundry distributing step may berepeated. As the laundry distributing step is implemented before therinsing-spinning step, the time of the rinsing cycle may be increased.In particular, as the laundry distributing step is repeated, the time ofthe rinsing cycle may be increased noticeably and the time consumed bythe rinsing cycle cannot be predicted accurately.

As follows, to solve the above problem, a control method of the rinsingcycle capable of reducing the overall time consumed by the rinsing cyclewill be described.

As shown in FIG. 21, the rinsing cycle of the washing machine accordingto the second embodiment may include a washing water supplying step, adrum driving step (S2151) and a water draining step (S2153). Comparedwith the first embodiment, the rinsing cycle according to the secondembodiment omits a rinsing-spinning step. Since the rinsing-spinningcycle is omitted, the time of the rinsing cycle may be reduced as muchas the time of the rinsing-spinning step and the laundry distributingstep may not be necessary, thus preventing noticeably increased time ofthe rinsing cycle caused by the repetition of the laundry distributingstep. Although omitting the rinsing-spinning step reduces the time ofthe rinsing cycle, the rinsing-spinning step configured to removedetergent remnants by rotating the laundry at the relatively high speedis omitted and then it would be difficult to remove the detergentremnants sufficiently.

As a result, in the control method of the rinsing cycle according to thesecond embodiment, the drum is rotated at the second rotation speed (RPM2) for approximately 1 to 3 minutes, and not stopped in the waterdraining step. The second rotation speed is determined to be apredetermined speed that allows the laundry to be attached to the innersurface of the drum due to gravity, and not dropped, during the rotationof the drum. The second rotation speed may be set for the centrifugalforce generated by the rotation of the drum to be larger than thegravity acceleration. Also, the second rotation speed may be set to belower than the over speed area of the washing machine. If the drum isrotated over the over-speed area, the resonance may increase the noiseand the vibration remarkably. As a result, the second rotation speed maybe set to be approximately 100 to 170 RPM.

Eventually, the draining step rotates the drum at the predeterminedspeed and thus the laundry may be in close contact with the innersurface of the drum due to the centrifugal force so as to removedetergent remnants from the laundry. Compensating for the omittedrinsing-spinning step, the draining step rotes the drum at the secondrotation speed to prevent deterioration of the rinsing ability.

In the step of rotating the drum at the second rotation speed (thepredetermined speed that allows the laundry to be in close contact withthe inner surface of the drum), if the water held in the tub is drained,all of the draining steps may be implemented before the rinsing cycle.That is, even if the water is drained in the washing cycle, the step ofrotating the drum at the predetermined RPM may be implemented.

M.3 Spinning Cycle (S2170);

A spinning cycle of this course may be similar to the spinning cycles ofthe other courses, for example, the spinning cycle of Course A. Thus,further detailed description thereof will be omitted.

Course M described above may be applied to the washing machine accordingto the second embodiment. However, Course M may also be applied to thewashing machine according to the first embodiment. That is, Course M maybe applicable to any of the washing machines according to the first andsecond embodiments.

N. Time Management Option:

A time management option will now be described. Generally, once aspecific course is selected, an operation of the selected course startsbased on a preset algorithm and the operation finishes in apredetermined amount of time. The operation time required to implementthe course may be to the total of the times required by the individualcycles composing the course. This total operation time may be displayedon the display part 119.

In certain circumstances, the operation time may be too long. Forexample, if the user has to leave in 1 hour and the preset operationtime is 1 hour and 20 minutes, the operation time is 20 minutes longerthan desirable to the user. In contrast, severe contamination may makethe washing operation implemented for 1 hour and 20 minutes notsufficient to wash the laundry. To solve the problem, a washing machineand control method thereof capable of managing time are provided.

The washing machines described above may include a time managementoption provided to manage time. That is, the operation time of aspecific course may be increased or decreased via the option part.Specifically, the user may select a time save option from the timemanage option. Alternatively, the user may select an intensive optionvia the time manage option. If no such options are selected, theoperation may be implemented according to the preset course. This timemanage selection may be implemented before the washing cycle starts andafter selecting the operation course.

For example, when the user selects the time save option if the operationtime of the cotton course is 120 minutes, the required operation timemay be reduced to, for example, 100 minutes. When the user selects theintensive option, the operation time may be increased to 140 minutes toensure sufficient cleaning of heavily contaminated laundry items. Theremay be a predetermined difference between the preset time and theactually required time.

The required time of the washing cycle and/or the rinsing cycle may bechangeable according to the selection of the time save option. That is,the cycle whose required operation time is changed/adjusted may bedifferent depending on the selected course. For example, in case of thecotton course, the synthetic course and the mixture course, it isimportant to improve the washing ability. Because of that, the requiredtime of the normal washing cycle may not be changeable even if the timesave option is selected. Thus, the required time of one of thecomponents of the rinsing cycle may be considered for adjustment.

The rinsing cycle repeats the water supplying, water draining andspinning. The rinsing may be implemented two times, three times or fourtimes. The spinning may be implemented in the same order of the spinningcycle, with the RPM and the time of the main-spinning less than those ofthe spinning cycle. As a result, when the time save option is selected,the main-spinning of the rinsing cycle may be omitted.

When the time save option is selected, the laundry amount determiningstep may be omitted, depending on the selected course. For example, whenthe wool, delicate or sportswear course is selected, the amount of thisspecial fabric is relatively small. If such the fabric items getcontaminated, the user tends to wash them immediately. As a result, itis rare to wash a large amount of these types of laundry items in asingle course operation. Considering that, the laundry amountdetermining step may be omitted when the wool, delicate or sportswearcourse is selected.

In contrast, when the intensive option is selected, the number ofrinsing implementations in the rinsing cycle or the required time of thewashing cycle may be increased, or both may be increased.

This time management option satisfies the object of the specific courseand allows the user to manage time conveniently.

IV. Drum Driving Motion According to Course and Step of Course

A drum driving motion according to each cycle of each course will now bedescribed. As mentioned above, the drum driving motion includes acombination of the drum rotation direction and the drum rotation speed,and differentiates the dropping direction and the dropping point of thelaundry located in the drum to compose the different drum motions. Thesedrum driving motions may be implemented under the control of the motor.

Since the laundry is lifted by the lift provided at the innercircumferential surface of the drum during the rotation of the drum, therotation speed and the rotation direction of the drum are controlled todifferentiate the shock applied to the laundry. That is, the mechanicalforce including friction between laundry items, friction between thelaundry and the wash water and the dropping shock may be differentiated.In other words, a laundry striking or scrubbing level may bedifferentiated to wash the laundry, and a laundry distribution level ora laundry turning-over level may be differentiated.

As a result, a drum driving motion may be differentiated according toeach cycle composing various washing courses and each specific stepcomposing each cycle so that the laundry may be treated by an optimizedmechanical force. Because of that, washing efficiency may be improved.In addition, a single fixed drum driving motion may result in excessivewashing time. A drum driving motion for each cycle will now bedescribed.

1. Washing Cycle:

A washing cycle includes a laundry amount determining step, a watersupplying step and a washing step. The water supplying step includes adetergent dissolution promoting step configured to dissolve detergentand a laundry wetting step configured to wet the laundry. The detergentdissolution promoting step and the laundry wetting step may be providedindependently, separate from the water supplying step. A heating stepmay be further provided according to each course.

1.1. Laundry Amount Determining:

Electric currents used to rotate the drum are measured to implement thelaundry amount determining step. In this case, when the drum is rotatedin a predetermined direction, the consumed currents are measured, andthe drum may be driven according to a single rotation motion, forexample, the tumbling motion, in the laundry amount determining step.

1.2 Water Supplying:

In a water supplying step, wash water is supplied together withdetergent and a step of dissolving the detergent may be implemented. Toimprove the efficiency of the washing cycle, detergent dissolution maybe completed effectively in an initial stage of the water supplyingstep. To dissolve the detergent in the wash water quickly, a motionconfigured to apply a strong mechanical force may be effective. That is,a strong mechanical force is applied to the wash water to dissolve thedetergent in the wash water more effectively. As a result, in thedetergent dissolution promoting step, the drum is rotated according tothe step motion and/or the scrub motion. As mentioned above, the stepmotion and the scrub motion rotate the drum at relatively high speed,applying a sudden brake to the drum to change directions, and a strongmechanical force may be provided. A combination of the step motion andthe scrub motion may be possible in this step.

In the laundry wetting promoting step, it is important to wet thelaundry in the wash water mixed with the detergent. In this case, a drumdriving motion may be the filtration motion. Alternatively, thefiltration motion and the rolling motion may be implementedsequentially. The rolling motion continuously turns over the laundry toenable the wash water held in the lower portion of the drum to contactwith the laundry uniformly and is proper in laundry wetting. Thefiltration motion broadens the laundry during the rotation of the drumto bring the laundry into close contact with the inner circumferentialsurface of the drum, while spraying the wash water into the drumsimultaneously, such that the wash water may be discharged from the tubvia the laundry and the through holes of the drum due to the centrifugalforce. As a result, the filtration motion broadens the surface area ofthe laundry and allows the wash water to pass through the laundry.Because of that, an effect of supplying the wash water to the laundryuniformly may be achieved. Also, to use such the effect, different twodrum driving motions, that is, the filtration motion and the rollingmotion are repeated sequentially in the laundry wetting promoting step.If the laundry amount is a predetermined value or more, the laundrywetting effect may be deteriorated in the rolling motion having therelatively low rotation speed of the drum, and thus the tumbling motionhaving a relatively high rotation speed of the drum may be implementedinstead of the rolling motion.

However, the detergent dissolution promoting step or the laundry wettingstep of the water supplying step may be classified according to thedriving motion of the drum when the wash water is continuously supplied.As a result, it is difficult for the user to distinguish the above stepsin the water supplying step. From the view of the user, it seems thatthe drum is driven according to one of the rolling and/or tumblingand/or step and/or scrub motions in the water supplying step, or acombination of two or more of the motions.

According to the type of fabric of the laundry, there may be coursesconfigured to prevent laundry fabric damage. Also, according to thecourse, there may be courses configured to suppress noise generationwhen the laundry is washed based on the courses. When the drum is drivenaccording to the motion capable of applying a strong mechanical force inthe water supplying step, laundry fabric damage or noise generation maybe difficult to avoid, in general. As a result, in the water supplyingsteps, motions capable of reducing the noise generation as much aspossible or preventing fabric damage are provided. In these courses, thedetergent dissolution effect and laundry wetting effect are achieved sothat, in these courses, the drum may be driven in the swing motion orthe time of the rolling motion may be increased.

The swing motion may minimize the motion of the laundry inside the drum,compared with the other motions, and it may minimize fabric damagegenerated by the friction of laundry items and the friction between thelaundry and the drum. In addition, the rolling motion induces therolling-movement of the laundry along the inner surface of the drum, anddoes not generate shock generated by the sudden dropping of the laundry.

If the detergent dissolution and the laundry wetting are implemented inthe water supplying step, a circulating step configured to circulate thewash water may be provided in at least predetermined step. Such acirculating step may be implemented over the water supplying step or ina predetermined stage of the water supplying step.

1.3 Heating:

In a heating step, a drum driving motion configured to transmit heatgenerated while the heater provided in the tub heats the wash water tothe laundry may be provided. In the heating step, the drum is drivenaccording to the tumbling motion configured to rotate the drum in thepredetermined direction continuously. If the rotation direction of thedrum is changed, a vortex is generated in the wash water and heattransmission efficiency may be deteriorated. f the laundry amount isless than a predetermined laundry amount level, the drum is driven inthe rolling motion. If the laundry amount is the predetermined laundryamount level or more, the drum is driven in the tumbling motion. Therolling motion can heat the laundry sufficiently if the laundry amountis less than the predetermined level. If the laundry amount is thepredetermined level or more, the tumbling motion configured to rotatethe drum at the relatively high speed may be proper.

1.4 Washing:

A washing step may take the longest time of the washing cycle. In thewashing step, contaminants of the laundry may be substantially removedand a drum driving motion of the washing step may be a motion capable ofmoving the laundry in various patterns. For example, the drum drivingmotion of the washing step may be one of, or a combination of, the stepmotion and/or the tumbling motion and/or the rolling motion. Such acombination of the motions can apply a strong mechanical force to thelaundry. Especially, in the case of a small amount of the laundry, acombination of these motions may be effective.

The drum driving motion of the washing step may be a combination of thefiltration motion and the tumbling motion. Such a drum driving motioncan supply wash water to the laundry continuously to improve washingefficiency and can apply mechanical force to the laundry uniformly toimprove washing efficiency. Such a combination may be effective with alarge amount of laundry.

A heating step is provided before the washing step and the wash watermay be heated in the washing step to improve washing efficiency. If thewash water is heated, drum driving motions may be combined. For example,if the heater provided in the tub is driven to heat the wash water, thedrum may be driven according to a drum driving motion having nosudden-brake.

As mentioned above, in the courses configured to prevent fabric damageand to suppress noise generation, a motion capable of applying arelatively weak mechanical force to the laundry may be provided in thewashing step. For example, the washing steps of the above courses, theswing motion may be implemented to reduce noise generation and preventfabric damage. As a result, the operation time of the swing motion maybe longer than the other motions in the course. If the washing step isimplemented by only the swing motion, the washing efficiency may bedeteriorated and a motion having a strong mechanical force may beadditionally provided. The operation time of the motion having thestrong mechanical force may be set to be shorter than that of the motionhaving the weak mechanical force.

2. Rinsing Cycle:

In the rinsing cycle, water supplying, drum driving and draining stepsare repeated to rinse contaminants attached to the laundry or detergentremnants. As a result, a drum driving motion of the rinsing cycle may bea motion capable of generating a scrubbing-like effect. Fore example,the drum driving motion of the rinsing cycle may be the scrub motionand/or the swing motion. Both the scrub motion and the swing motion havethe effect of scrubbing and swinging the laundry in the wash watercontinuously, to improve rinsing ability.

When the drum is driven in the rinsing cycle, a circulating stepconfigured to circulate the wash water held in the tub into the druminside and the filtration motion may be implemented together. That is,the wash water is sprayed into the drum and the laundry is rinsed by theflowing water. The filtration motion generates a strong centrifugalforce and may separate the detergent and contaminants of the laundryfrom the laundry, together with the wash water.

In the rinsing cycle, wash water may be drained together with bubbles byusing mechanical force applied to the laundry during the draining and/orintermediate-spinning. As a result, the drum is driven in the stepmotion or tumbling motion. By dropping the lifted laundry, the washingefficiency may be improved and the bubbles may be removed smoothly. Thedrum driving motion may be differentiated according to the laundryamount. That is, in the case of a small amount of laundry, the stepmotion is implemented to generate a maximum dropping distance. In thecase of a large amount of laundry, the tumbling motion is implemented.

As mentioned above, in the courses selected to prevent fabric damage orto suppress noise generation, the motion capable of applying arelatively weak mechanical force to the laundry may be provided in therinsing cycle. For example, the swing motion may be provided in therinsing cycles of the courses. In the course selected to reduce washingtime, it is possible to reduce the time of the rinsing cycle. Forexample, the filtration motion consumes a relatively large amount oftime and thus the filtration motion may be omitted in the drum drivingstep of the rinsing cycle in the case of a course selected to reduce theoverall washing time.

3. Spinning Cycle:

In a spinning cycle, the drum is rotated at a predetermined speed orhigher to remove moisture contained in the laundry and the spinningcycle may include a laundry disentangling step and an eccentricitymeasuring step to accelerate the rotation speed of the drum to apredetermined RPM. A proper drum driving motion may be selectedaccording to the object of each step. For example, it is advantageous inthe laundry disentangling step to apply a relatively strong mechanicalforce to the laundry. If a motion capable of applying a strongmechanical force is provided in the prior rinsing cycle, even a motionhaving a weak mechanical force is sufficient. Also, to measure theeccentricity accurately, a drum driving motion configured to rotate thedrum in a single direction continuously may be appropriate in theeccentricity measuring step.

V. New Courses

In describing the various courses, each course includes a washing cycle,a rinsing cycle and a spinning cycle. However, it is possible to omit asingle cycle from each course according to the user's selection. Thatis, it is possible to omit the washing cycle from Course A (StandardCourse) or to omit the rinsing cycle from Course B (Heavy ContaminantCourse) or to omit the spinning cycle from Course C (Quick BoilingCourse). By extension, one of the cycles provided in each course may beset as an auxiliary course. Fore example, the washing cycle of course F(Functional Clothing Course) may be set as single new course. In thiscase, it may be referred to as ‘functional clothing washing’. Ratherthan the washing cycle, the rinsing cycle or the spinning cycle providedin each course may be set as new course.

Although the washing cycle, the rinsing cycle and the spinning cycle aredescribed in a particular order to explain each of the courses, suchcycles of one course may be combined with cycles of another course toestablish new course. For example, the rinsing cycle and the spinningcycle of Course A (Standard Course) may be combined with the washingcycle of Course B (Heavy Contaminant Course) and set as a new course.Alternatively, each cycle may be taken out of the other courses. Forexample, the rinsing cycle of course A (Standard Course) and thespinning cycle of Course M may be combined with the washing cycle ofCourse B (Heavy Contaminant Course) and set as a new course. In thiscase, steps configured to connect the cycles may be adjusted or changedas appropriate.

Further, new course can be made based on efforts and conditions oflaundry. FIGS. 22 to 24 illustrates the steps, effects and conditionsused to determine the motions for standard course, strong motion course(heavy contaminant course, quick boiling course and cool wash course)and weak motion course (color, delicate or wool course). Based ondesired effects and conditions, the motions of the drums can be selectedinterchangeable between standard course, strong motions course and weakmotion course to create new programs. The present disclosure andfeatures can be further applied to motion of the drum of a dryer, which,for example, are disclosed in US Patent Pub. Nos. 2009/0126222,2010/0005680 and 2010/0162586, whose entire disclosure is incorporatedherein by reference.

Any reference in this specification to “one embodiment,” “anembodiment,” “example embodiment,” etc., means that a particularfeature, structure, or characteristic described in connection with theembodiment is included in at least one embodiment of the invention. Theappearances of such phrases in various places in the specification arenot necessarily all referring to the same embodiment. Further, when aparticular feature, structure, or characteristic is described inconnection with any embodiment, it is submitted that it is within thepurview of one skilled in the art to effect such feature, structure, orcharacteristic in connection with other ones of the embodiments.

Although embodiments have been described with reference to a number ofillustrative embodiments thereof, it should be understood that numerousother modifications and embodiments can be devised by those skilled inthe art that will fall within the spirit and scope of the principles ofthis disclosure. More particularly, various variations and modificationsare possible in the component parts and/or arrangements of the subjectcombination arrangement within the scope of the disclosure, the drawingsand the appended claims. In addition to variations and modifications inthe component parts and/or arrangements, alternative uses will also beapparent to those skilled in the art.

What is claimed is:
 1. A method of operating a laundry machine including a tub to store water therein and a drum provided in the tub to store laundry therein, the method comprising: implementing a first motion that comprises rotating the drum in a clockwise direction and a counter-clockwise direction alternately; and implementing a second motion that comprises: rotating the drum in one of a clockwise direction or a counterclockwise direction at a first RPM that generates centrifugal force equal to or greater than 1 G; rotating the drum at a second RPM that is lower than the first RPM without a change in rotation direction, the second RPM generating centrifugal force equal to or greater than 1 G; and repeating rotating the drum at the first RPM and rotating the drum at the second RPM.
 2. The method of clam 1, wherein the second motion makes the laundry in the drum remain to be drawn toward an inner surface of the drum by centrifugal force.
 3. The method of claim 1, wherein the second motion further comprises spraying water into the drum.
 4. The method of claim 3, wherein spraying water into the drum sprays water supplied by a supply path connected to a water source.
 5. The method of claim 3, wherein spraying water into the drum sprays water discharged from the tub by a pump that discharges the water in the tub and a circulation path that supplies the water discharged from the pump to the tub.
 6. The method of clam 1, wherein the first motion comprises: rotating the drum in one of a clockwise direction or a counterclockwise direction at an RPM that generates centrifugal force less than 1 G; and rotating the drum in the other one of a clockwise direction or a counterclockwise direction at an RPM that generates centrifugal force less than 1 G.
 7. The method of claim 6, wherein the first motion makes the laundry in the drum drop by the weight of the laundry before the drum rotates 90 degrees.
 8. The method of claim 7, wherein the first motion makes laundry in the drum move only within a lower half of the drum.
 9. The method of clam 1, wherein the first motion comprises: rotating the drum in a clockwise direction at an RPM that generates centrifugal force less than 1 G; stop the rotation of the drum when the drum rotates 90 degrees in the clockwise direction; rotating the drum in a counterclockwise direction at an RPM that generates centrifugal force less than 1 G; and stop the rotation of the drum when the drum rotates 90 degrees in the counterclockwise direction.
 10. The method of claim 7, wherein the first motion makes laundry in the drum move only within a lower half of the drum.
 11. The method of claim 7, wherein the laundry in the drum separates from an inner surface of the drum when the drum stops.
 12. The method of claim 1, wherein the implementation of the first motion and the implementation of the second motion performed consecutively.
 13. The method of claim 1, wherein the implementation of the second motion and the implementation of the first motion performed consecutively.
 14. A method of operating a laundry machine including a tub to store water therein and a drum provided in the tub to store laundry therein, the method comprising: implementing a first motion that comprises rotating the drum in a clockwise direction and a counter-clockwise direction alternately; and implementing a second motion that comprises: accelerating a rotation of the drum in one of a clockwise direction or a counterclockwise direction to draw laundry toward an inner surface of the drum; decelerating the rotation of the drum without a change in rotation direction not to allow the laundry to fall from the inner surface of the drum; and repeating the accelerating the rotation of the drum and the decelerating the rotation of the drum.
 15. The method of claim 14, wherein the rotation speed in accelerating and decelerating the rotation of the drum is an RPM that generates centrifugal force equal to or greater than 1 G.
 16. The method of claim 15, wherein the second motion further comprises spraying water into the drum.
 17. The method of claim 16, wherein spraying water into the drum sprays water supplied by a supply path connected to a water source.
 18. The method of claim 16, wherein spraying water into the drum sprays water discharged from the tub by a pump that discharges the water in the tub and a circulation path that supplies the water discharged from the pump to the tub.
 19. The method of claim 16, wherein the first motion makes laundry in the drum move only within a lower half of the drum. 